Comprehensive and Detailed Step-by-Step Explanation:
An effective information security program aims to manage risks to acceptable levels while supporting business objectives.
* A. Risk is treated to an acceptable level: This is the BEST answer as it directly reflects the program's success in mitigating risks within the organization's tolerance levels.
* B. The number of security incidents reported by staff has increased: An increase in reported incidents might indicate improved awareness but does not necessarily reflect overall effectiveness.
* C. Key risk indicators (KRIs) are established: KRIs are important for monitoring risks but do not indicate whether risks are being effectively managed.
* D. Policies are reviewed and approved by senior management: While essential, this action alone does not demonstrate the program's effectiveness.
Reference: CISM Job Practice Area 2 (Risk Management) highlights the importance of risk treatment and its alignment with organizational risk tolerance.