Explanation
When applying the Top Threats Analysis methodology following an incident, the scope of the technical impact identification step is to determine the impact on confidentiality, integrity, and availability of the information system. The Top Threats Analysis methodology is a framework developed by the Cloud Security Alliance (CSA) to help organizations identify, analyze, and mitigate the most critical threats to cloud computing. The methodology consists of six steps: threat identification, threat analysis, technical impact identification, business impact analysis, risk assessment, and risk treatment12.
The technical impact identification step is the third step of the methodology, and it aims to assess how the incident affected the security properties of the information system, namely confidentiality, integrity, and availability. Confidentiality refers to the protection of data from unauthorized access or disclosure. Integrity refers to the protection of data from unauthorized modification or deletion. Availability refers to the protection of data and services from disruption or denial. The technical impact identification step can help organizations to understand the severity and extent of the incident and its consequences on the information system12.
The other options are not within the scope of the technical impact identification step. Option A, determine the impact on the controls that were selected by the organization to respond to identified risks, is not within the scope because it is part of the risk treatment step, which is the sixth and final step of the methodology. Option C, determine the impact on the physical and environmental security of the organization, excluding informational assets, is not within the scope because it is not related to the information system or its security properties. Option D, determine the impact on the financial, operational, compliance, and reputation of the organization, is not within the scope because it is part of the business impact analysis step, which is the fourth step of the methodology. References := Top Threats Analysis Methodology - CSA1 Top Threats Analysis Methodology - Cloud Security Alliance

Explanation
The organization (client) is accountable for the use of a cloud service. Accountability in cloud computing is the responsibility of cloud service providers and other parties in the cloud ecosystem to protect and properly process the data of their clients and users. However, accountability ultimately rests with the organization (client) that uses the cloud service, as it is the data owner and controller. The organization (client) has to ensure that the cloud service provider and its suppliers meet the agreed-upon service levels, security standards, and regulatory requirements. The organization (client) also has to perform due diligence and oversight on the cloud service provider and its suppliers, as well as to comply with the shared responsibility model, which defines how the security and compliance tasks and obligations are divided between the cloud service provider and the organization (client)123.
The other options are not correct. Option A, the cloud access security broker (CASB), is incorrect because a CASB is a software tool or service that acts as an intermediary between cloud users and cloud service providers, providing visibility, data security, threat protection, and compliance. A CASB does not use the cloud service, but facilitates its secure and compliant use4. Option B, the supplier, is incorrect because a supplier is a third-party entity that provides services or products to the cloud service provider, such as infrastructure, software, hardware, or support. A supplier does not use the cloud service, but supports its delivery5. Option C, the cloud service provider, is incorrect because a cloud service provider is a company that provides cloud computing services to the organization (client). A cloud service provider does not use the cloud service, but offers it to the organization (client)6. References := Accountability Issues in Cloud Computing (5 Step ... - Medium1 Shared responsibility in the \uE000cloud\uE001 - Microsoft Azure2 Who Is Responsible for Cloud Security? - Security Intelligence3 What is CASB? - Cloud Security Alliance4 Cloud Computing: Auditing Challenges - ISACA5 What is Cloud Provider? - Definition from Techopedia

Explanation
Identity and access management (IAM) and data protection are the areas that should be reviewed when auditing a public cloud, as they are the key aspects of cloud security and compliance that affect both the cloud service provider and the cloud service customer. IAM and data protection refer to the methods and techniques that ensure the confidentiality, integrity, and availability of data and resources in the cloud environment. IAM involves the use of credentials, policies, roles, permissions, and tokens to verify the identity and access rights of users or devices. Data protection involves the use of encryption, backup, recovery, deletion, and retention to protect data from unauthorized access, modification, loss, or disclosure123.
Patching and configuration (A) are not the areas that should be reviewed when auditing a public cloud, as they are not the key aspects of cloud security and compliance that affect both the cloud service provider and the cloud service customer. Patching and configuration refer to the processes and practices that ensure the security, reliability, and performance of the cloud infrastructure, platform, or software. Patching involves the use of updates or fixes to address vulnerabilities, bugs, errors, or exploits that may compromise or affect the functionality of the cloud components. Configuration involves the use of settings or parameters to customize or optimize the functionality of the cloud components. Patching and configuration are mainly under the responsibility of the cloud service provider, as they own and operate the cloud infrastructure, platform, or software. The cloud service customer has limited or no access or control over these aspects123.
Vulnerability management and cyber security reviews (B) are not the areas that should be reviewed when auditing a public cloud, as they are not specific or measurable aspects of cloud security and compliance that can be easily audited or tested. Vulnerability management and cyber security reviews refer to the processes and practices that identify, assess, treat, monitor, and report on the risks that affect the security posture of an organization or a domain. Vulnerability management involves the use of tools or techniques to scan, analyze, prioritize, remediate, or mitigate vulnerabilities that may expose an organization or a domain to threats or attacks. Cyber security reviews involve the use of tools or techniques to evaluate, measure, benchmark, or improve the security capabilities or maturity of an organization or a domain. Vulnerability management and cyber security reviews are general or broad terms that encompass various aspects of cloud security and compliance, such as IAM, data protection, patching, configuration, etc. Therefore, they are not specific or measurable areas that can be audited or tested individually123.
Source code reviews and hypervisor (D) are not the areas that should be reviewed when auditing a public cloud, as they are not relevant or accessible aspects of cloud security and compliance for most cloud service customers. Source code reviews refer to the processes and practices that examine the source code of software applications or systems to identify errors, bugs, vulnerabilities, or inefficiencies that may affect their quality, functionality, or security. Hypervisor refers to the software that allows the creation and management of virtual machines on a physical server. Source code reviews and hypervisor are mainly under the responsibility of the cloud service provider, as they own and operate the software applications or systems that deliver cloud services. The cloud service customer has no access or control over these aspects123. References := Cloud Audits: A Guide for Cloud Service Providers - Cloud Standards ...
Cloud Audits: A Guide for Cloud Service Customers - Cloud Standards ...
Cloud Auditing Knowledge: Preparing for the CCAK Certificate Exam