Comprehensive and Detailed Explanation:

Mean Time Between Failures measures average operational time between failures of repairable assets. It is a reliability metric rather than a cost or durability measure. If machinery runs for 240 hours and fails five times, the observed MTBF is 48 hours, or two days of continuous operation. This is an average, not a prediction that failure will occur precisely every second day. Availability additionally depends on how quickly the machine is restored after a failure. Where consequences are significant, managers should prioritise preventive controls, reliable monitoring and prompt restoration. Performance measures such as downtime, MTBF, repair time and availability help identify weaknesses. The chosen technique must also account for costs, safety and the possibility of common-cause failures. The appropriate selection is reliability. This follows from the distinction between the concept described and the alternative activities or measures in the answer choices. Documented responsibilities, suitable spare capacity and tested recovery arrangements can reduce the duration and consequences of disruption.

Study Guide Reference: CIPS L5M9 – Explain techniques in failure prevention and recovery that can be applied in operations management; the uploaded question bank cites study-guide page(s) 94.