According to the 1.9 Ownership & Accountability - CRISC, risk ownership is best established by mapping risk to specific business process owners. Details of the risk owner should be documented in the risk register.
Results of the risk monitoring should be discussed and communicated with the risk owner as they own the risk and are accountable for maintaining the risk within acceptable levels. To ensure effective risk ownership, it is most important that risk owners have decision-making authority, as this enables them to take timely and appropriate actions to manage the risk and ensure that it is aligned with the organization's risk appetite and tolerance. Without decision-making authority, risk owners may not be able to implement the necessary risk responses or escalate the issues to the relevant stakeholders. Therefore, the answer is D. risk owners have decision-making authority. References = 1.9 Ownership & Accountability - CRISC, The Importance of Effective Risk Governance in the C-suite - Aon

The main benefit of using key risk indicators (KRIs) for an organization is that they provide an early warning that a risk threshold is about to be reached. KRIs are metrics that measure the likelihood and impact of risks, and help monitor and prioritize the most critical risks. KRIs also help to trigger timely and appropriate risk responses, before the risk becomes unmanageable or unacceptable. The other options are not the main benefit of using KRIs, although they may be secondary benefits or outcomes. KRIs signal that a change in the control environment has occurred, provide a basis to set the risk appetite for an organization, and assist in the preparation of the organization's risk profile. References = Risk and Information Systems Control Study Manual, Chapter 4, Section 4.4.1, page 4-36.

The best way to ensure that access remains appropriate for an organization that practices the principle of least privilege is to review user access rights on a regular basis by obtaining an access control matrix and approval from the user's manager. An access control matrix is a table that shows the access rights and permissions of each user or role for each resource or function. An access control matrix helps to verify that the users have the minimum level of access required to perform their duties, and to identify any unauthorized or excessive access rights. Approval from the user's manager helps to confirm that the user's access rights are consistent with their current role and responsibilities, and to authorize any changes or exceptions as needed. References
= Risk and Information Systems Control Study Manual, 7th Edition, Chapter 3, Section 3.2.2, page 1281

Data confidentiality risk is the risk that the data may be accessed, disclosed, or modified by unauthorized parties, resulting in breaches of privacy, trust, or compliance1. Platform as a Service (PaaS) is a cloud computing model that provides a platform for developing, testing, and deploying applications, without requiring the users to manage the underlying infrastructure2. An internally developed payroll application is an application that is created and maintained by the organization itself, rather than by a third-party vendor, and that is used to process and manage the payroll data of the organization's employees3. The owner of the data confidentiality risk is the person or entity that has the authority and accountability for the data and its protection, and that is responsible for identifying, assessing, and mitigating the risk. The owner of the data confidentiality risk related to an internally developed payroll application that leverages PaaS infrastructure from the cloud is the human resources head, as they are the person who oversees the human resources function and the payroll data of the organization. The human resources head has the best understanding of the sensitivity, value, and usage of the payroll data, and the potential impacts and implications of a data confidentiality breach. The human resources head also has the ability and responsibility to define and implement the policies, procedures, and controls that are necessary to protect the payroll data, and to monitor and report on the performance and compliance of the data confidentiality risk management. The IT infrastructure head, the supplier management head, and the application development head are not the best choices for owning the data confidentiality risk related to an internally developed payroll application that leverages PaaS infrastructure from the cloud, as they do not have the same level of authority and accountability as the human resources head. The IT infrastructure head is the person who oversees the IT infrastructure function and the PaaS infrastructure of the organization. The IT infrastructure head may be involved in providing input and feedback to the human resources head on the data confidentiality risk management, especially those related to the PaaS infrastructure, but they do not have the final say or the overall responsibility for the payroll data and its protection. The supplier management head is the person who oversees the supplier management function and the relationship with the cloud service provider that provides the PaaS infrastructure. The supplier management head may be involved in negotiating and enforcing the service level agreements and the security requirements with the cloud service provider, but they do not have the authority or the expertise to manage the data confidentiality risk of the payroll data. The application development head is the person who oversees the application development function and the development, testing, and deployment of the payroll application. The application development head may be involved in designing and implementing the security features and controls of the payroll application, but they do not have the perspective or the influence to manage the data confidentiality risk of the payroll data. References
= 3: Payroll Software: What Is It & How Does It Work? | QuickBooks2: What is Platform as a Service (PaaS)? | IBM1: Data Confidentiality: Identifying and Protecting Assets Against Data ... : [Risk Ownership - Risk Management] : [Human Resources and Payroll Security Policy - University of ...] : [Risk and Information Systems Control Study Manual, Chapter 1: IT Risk Identification, Section 1.1: IT Risk Concepts, pp. 17-19.] : [Risk and Information Systems Control Study Manual, Chapter 2: IT Risk Assessment, Section
2.1: Risk Identification, pp. 57-59.] : [Risk and Information Systems Control Study Manual, Chapter 4: Risk and Control Monitoring and Reporting, Section 4.2: Risk Monitoring, pp. 189-191.] : [Risk and Information Systems Control Study Manual, Chapter 5: Information Systems Control Design and Implementation, Section
5.1: Control Design, pp. 233-235.] : [Risk and Information Systems Control Study Manual, Chapter
5:Information Systems Control Design and Implementation, Section 5.2: Control Implementation, pp. 243-245.]
[Risk and Information Systems Control Study Manual, Chapter 5: Information Systems Control Design and Implementation, Section 5.3: Control Monitoring and Maintenance, pp. 251-253.]

The best course of action when a risk practitioner identifies a database application that has been developed and implemented by the business independently of IT is to include the application in IT risk assessments. IT risk assessments are the process of identifying, analyzing, and evaluating the IT-related risks that could affect the achievement of the enterprise's objectives. By including the application in IT risk assessments, the risk practitioner can identify the potential threats, vulnerabilities, and impacts associated with the application, and recommend the appropriate controls and mitigation strategies to reduce the risk to an acceptable level.
Escalating the concern to senior management, documenting the reasons for the exception, and proposing that the application be transferred to IT are not the best courses of action, as they do not address the risk exposure and impact of the application, and may not be feasible or desirable for the business. References = CRISC Review Manual, 6th Edition, ISACA, 2015, page 47.