Comprehensive and Detailed Explanation:

The CGEIT Review Manual 8th Edition, in its Governance of Enterprise IT domain, emphasizes monitoring system performance against defined objectives, such as availability. Performance indicators, often tied to service level agreements (SLAs), provide specific, measurable data (e.g., system uptime percentage) to assess whether availability objectives are met. For example, a performance indicator showing 99.8% uptime directly informs the committee. The manual likely references COBIT 2019’s APO09-Managed Service Agreements, which prioritizes performance indicators for service monitoring.

Option A: Critical success factors (CSFs) define conditions for success but are less specific than performance metrics.

Option C: Capability maturity levels assess process maturity, not system availability.

Option D: Balanced scorecard provides a broad performance overview but is less focused on specific availability metrics.

Double Verification: The answer aligns with COBIT’s APO09 and the CGEIT domain’s focus on service performance. Performance indicators are the primary ISACA tool for availability assessment.

ISACA CGEIT Review Manual 8th Edition, Domain 1: Governance of Enterprise IT (focus on service monitoring).

COBIT 2019, APO09-Managed Service Agreements.

ISACA Glossary (for definitions of performance indicators), available at https://www.isaca.org/resources/glossary.