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 beenapplied. 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.