Which action is listed as part of the annual maintenance category?

• A. Complete system audit
• B. Filter inspection/replacement
• C. Fluid level verification
• D. System flushing if indicated by fluid analysis

Answer: (A)

Annual maintenance focuses on a comprehensive, system-wide health check and proper documentation. A complete system audit fits this purpose best because it evaluates overall performance, integrity of components, calibration, safety compliance, and records, giving a full picture of the system's readiness and any long‑term issues that may need attention.

The other actions are important but are typically done more frequently or only as needed. Filter inspection and replacement is a preventive task that tends to have a shorter interval to prevent clogging and loss of performance. Verifying fluid levels is a quick routine check that should happen regularly (often daily or per shift), not once a year. Flushing the system is a more invasive, condition-based action done only if fluid analysis indicates contamination or degradation, not as a standing annual requirement.