The control owner is the person who has the authority to approve an exception to a control. A control is a policy, procedure, or technical measure that is implemented to prevent or mitigate a risk. A control owner is responsible for the design, implementation, operation, and maintenance of the control, as well as for monitoring and reporting its performance and effectiveness. A control owner is also accountable for the approval of any changes or exceptions to the control, based on the risk assessment and business justification.
An information security manager, a risk owner, and a risk manager are not the best choices, as they do not have the same level of authority, responsibility, and knowledge as the control owner in relation to the control. References = CRISC Review Manual, 6th Edition, ISACA, 2015, page 35.