The correct answer is Information Security Officer.

The Information Security Officer provides oversight and advice to system owners during the selection and implementation of security controls. This role focuses on aligning control choices with organizational policy and risk tolerance and on coordinating the overall security posture while controls are chosen and put into place.

The ISSO acts as a governance and compliance advisor who helps interpret control baselines and tailoring guidance and who documents control decisions and residual risk for senior decision makers.

Cloud Security Engineer is primarily a technical implementer who configures and manages cloud services and applied controls rather than providing organizational oversight and policy advice during control selection.

Authorizing Official is the person who accepts the risk and formally authorizes a system to operate. That role makes the risk acceptance decision after controls are implemented and assessed instead of advising system owners while controls are being chosen.

Security Control Assessor independently evaluates and tests implemented controls to determine their effectiveness. The assessor role evaluates and documents control effectiveness rather than advising system owners during control selection.

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