The control owner should be responsible for evaluating the residual risk after a compensating control has been implemented. A compensating control is a control that provides an alternative or additional measure of protection when the primary or preferred control is not feasible or effective. A residual risk is the risk that remains after the risk response or mitigation has been applied. The control owner is the person who has the authority and responsibility for designing, implementing, and monitoring the controls that enforce the policy.
The control owner can assess the impact and effectiveness of the compensating control on the residual risk, and report the results and recommendations to the risk owner or the risk practitioner. The other options are not as responsible as the control owner, as they are related to the compliance, ownership, or management of the risk, not the evaluation of the control. References = Risk and Information Systems Control Study Manual, Chapter 4: Risk and Control Monitoring and Reporting, Section 4.4: Key Control Indicators, page 211.

The most important factor when identifying an organization's risk exposure associated with IoT devices is visibility into all networked devices. This means having a comprehensive inventory of all the IoT devices connected to the organization's network, as well as their configurations, functions, and security status.
Visibility enables the organization to identify the potential threats and vulnerabilities that IoT devices pose, as well as the impact and likelihood of those risks. Visibility also helps the organization to monitor the behavior and performance of IoT devices, detect any anomalies or incidents, and respond accordingly. Without visibility, the organization may be unaware of the existence, location, or condition of some IoT devices, which could lead to undetected breaches, data loss, or operational disruptions. References = Risk and Information Systems Control Study Manual, Chapter 1: IT Risk Identification, Section 1.4: IT Risk Identification Methods and Techniques, Page 28; 8 Internet of Things Threats and Risks to Be Aware of - SecurityScorecard Blog.

A risk management program is a systematic and structured approach to identify, analyze, evaluate, treat, monitor, and communicate the risks that may affect the organization's objectives and performance.
The greatest advantage of implementing a risk management program is enabling risk-aware decisions. This means that the organization incorporates the risk information and analysis into its decision making process, such as strategic planning, resource allocation, project management, etc.
Enabling risk-aware decisions helps to optimize the outcomes and benefits of the decisions, balance the opportunities and threats of the decisions, and align the decisions with the organization's risk appetite and tolerance.
The other options are not the greatest advantages of implementing a risk management program. They are either secondary or not essential for risk management.
The references for this answer are:
Risk IT Framework, page 25
Information Technology & Security, page 19
Risk Scenarios Starter Pack, page 17

The most important concern to address when formulating a social media policy to address information leakage is sharing company information on social media. Information leakage is the unauthorized or unintentional disclosure of confidential or sensitive information to unauthorized parties. Social media is a platform that enables the users to create and share content, such as text, images, videos, or links, with other users or the public. Sharing company information on social media is the most important concern, as it could expose the company's trade secrets, intellectual property, customer data, financial data, or strategic plans to competitors, hackers, or regulators. Sharing company information on social media could also damage the company's reputation, trust, or credibility, and result in legal or regulatory penalties, fines, or lawsuits.
Therefore, a social media policy should clearly define what constitutes company information, and what are the rules and guidelines for sharing or not sharing company information on social media. A social media policy should also specify the roles and responsibilities of the employees, managers, and the social media team, and the consequences and sanctions for violating the policy. Sharing personal information on social media, using social media to maintain contact with business associates, and using social media for personal purposes during working hours are not as important as sharing company information on social media, as they do not directly involve the leakage of company information, and they may not have significant impact or risk on the company. References = CRISC Review Manual, 6th Edition, ISACA, 2015, page 217

The percentage of projects introduced into production without high-risk issues is the most important measure of the effectiveness of risk management in project implementation, as it reflects the ability of risk management to ensure that the project deliverables meet the quality, functionality, and security requirements, and do not introduce unacceptable risks to the organization. The percentage of projects having the risk register updated regularly, having key risk indicators (KRIs) established to measure risk, or having an action plan to remediate overdue issues are not the most important measures, as they are more related to the process, performance, or compliance of risk management, rather than the outcome or value of risk management. References = CRISC Review Manual, 7th Edition, page 110.