The relationship owner is the person who has the authority and responsibility for managing the relationship with the service provider. The relationship owner should be accountable for ensuring that risk responses are implemented, as they are the primary point of contact and communication with the service provider. The relationship owner can also monitor and evaluate the performance and compliance of the service provider, and enforce the contractual obligations and service level agreements. The other options are not as accountable as the relationship owner, as they are related to the assessment, security, or legal aspects of the service provider, not the management or oversight of the service provider. References = Risk and Information Systems Control Study Manual, Chapter 3: IT Risk Response, Section 3.3: IT Risk Response Implementation, page 145.

The primary reason to update a risk register with risk assessment results is to communicate the level and priority of assessed risk to management, as this enables them to make informed decisions about risk response and allocation of resources. The risk register is a tool for documenting and reporting the current status of risks, their causes, impacts, likelihood, and responses. Updating the risk register with risk assessment results ensures that the information is accurate, relevant, and timely. The risk register also helps to monitor and track the progress and effectiveness of risk management activities. The other options are not the primary reasons to update the risk register, although they may be secondary benefits or outcomes of doing so. References = Risk and Information Systems Control Study Manual, Chapter 3: IT Risk Assessment, page 109.

Ineffective control implementation can result in increased risk exposure, reduced compliance, and diminished performance for the organization. Therefore, the most relevant information for stakeholders is the impact of ineffective control implementation on the business objectives, processes, and outcomes. The impact on business can include financial losses, reputational damage, operational inefficiencies, customer dissatisfaction, and legal liabilities. The other options are not as relevant as the impact on business, because they do not directly link the control effectiveness to the business value. References = Risk and Information Systems Control Study Manual, Chapter 4, Section 4.3.2, page 128.