According to the ISACA Cloud Auditing Knowledge Certificate Study Guide, the cloud customer is the entity that retains accountability for the business outcome of the system or the processes that are supported by the cloud service1. The cloud customer is also responsible for ensuring that the cloud service meets the legal, regulatory, and contractual obligations that apply to the customer's business context1. The cloud customer should also perform due diligence and risk assessment before selecting a cloud service provider, and establish a clear and enforceable contract that defines the roles and responsibilities of both parties1.
The cloud user is the entity that uses the cloud service on behalf of the cloud customer, but it is not necessarily accountable for the compliance of the service1. The cloud service provider is the entity that makes the cloud service available to the cloud customer, but it is not accountable for the compliance of the customer's business context1. The certification authority (CA) is an entity that issues digital certificates to verify the identity or authenticity of other entities, but it is not accountable for the compliance of the cloud service2. References:
* ISACA Cloud Auditing Knowledge Certificate Study Guide, page 10-11.
* Certification authority - Wikipedia

A RACI chart is a tool used to clarify the roles and responsibilities in processes, projects, or operations. In the context of cloud compliance, documenting these responsibilities in a RACI chart ensures that all parties within the enterprise are aware of their specific obligations regarding compliance with laws and regulations. This helps in creating a clear, organized view of how each part of the organization contributes to overall compliance, facilitating better coordination and accountability.
References = The answer is informed by general best practices in cloud compliance and governance, which recommend the use of RACI charts or similar tools to delineate responsibilities clearly. While I can't reference specific documents from the CCAK or related resources, these practices are widely accepted in the field of cloud security and compliance.

In multi-cloud environments, organizations use cloud services from multiple providers. This can lead to challenges in maintaining visibility and control over the data and services due to the varying management tools, processes, and security controls across different providers. The complexity of managing multiple service models and the reliance on different cloud service providers can reduce an organization's ability to monitor and control its resources effectively, thus increasing the risk of reduced visibility and control.
References = The information aligns with the principles outlined in the CCAK materials, which emphasize the unique challenges of auditing the cloud, including ensuring the right controls for confidentiality, integrity, and accessibility, and mitigating risks such as those associated with multi-cloud environments12.

The first step of the Cloud Risk Evaluation Framework is to identify key risk categories. Key risk categories are the broad areas or domains of cloud security and compliance that may affect the cloud service provider and the cloud service customer. Key risk categories may include data security, identity and access management, encryption and key management, incident response, disaster recovery, audit assurance and compliance, etc.
Identifying key risk categories helps to scope and focus the cloud risk assessment process, as well as to prioritize and rank the risks based on their relevance and significance. Identifying key risk categories also helps to align and map the risks with the applicable standards, regulations, or frameworks that govern cloud security and compliance12.
Analyzing potential impact and likelihood (A) is not the first step of the Cloud Risk Evaluation Framework, but rather the third step. Analyzing potential impact and likelihood is the process of estimating the consequences or effects of a risk event on the business objectives, operations, processes, or functions (impact), as well as the probability or frequency of a risk event occurring (likelihood). Analyzing potential impact and likelihood helps to measure and quantify the severity or magnitude of the risk event, as well as to prioritize and rank the risks based on their impact and likelihood12.
Establishing cloud risk profile (B) is not the first step of the Cloud Risk Evaluation Framework, but rather the second step. Establishing cloud risk profile is the process of defining and documenting the expected level of risk that an organization is willing to accept or tolerate in relation to its cloud services (risk appetite), as well as the actual level of risk that an organization faces or encounters in relation to its cloud services (risk exposure). Establishing cloud risk profile helps to determine and communicate the objectives, expectations, and responsibilities of cloud security and compliance, as well as to align and integrate them with the business strategy and goals12.
Evaluating and documenting the risks is not the first step of the Cloud Risk Evaluation Framework, but rather the fourth step. Evaluating and documenting the risks is the process of assessing and reporting on the effectiveness and efficiency of the controls or actions that are implemented or applied to prevent, avoid, transfer, or accept a risk event (risk treatment), as well as identifying and addressing any gaps or issues that may arise (risk monitoring). Evaluating and documenting the risks helps to ensure that the actual level of risk is aligned with the desired level of risk, as well as to update and improve the risk management strategy and plan12. References :=
* Cloud Auditing Knowledge: Preparing for the CCAK Certificate Exam
* Cloud Risk-10 Principles and a Framework for Assessment - ISACA