Concept:Preventive maintenance means taking proactive steps to avoid system faults, data loss, or hardware damage before they happen.
Explanation:Regularly updating the operating system installs security patches and bug fixes that stop software problems before they start.
Shutting down the system properly ensures all files are saved correctly and reduces the risk of file corruption or disk damage.
Using an uninterrupted power supply protects the computer from sudden power cuts and voltage fluctuations that can harm hardware.
Data recovery is the process of retrieving lost, corrupted, or damaged files after a failure has already occurred.
Since data recovery acts after the damage happens, it cannot be classified as a preventive maintenance measure.
All the other options A, B, and C are examples of preventive maintenance because they help prevent faults.
Answer:D. data recovery