Which of the following is a metric that can be used to assess system reliability?

The metric MTBF, or Mean Time Between Failures, is utilized to measure the reliability of a system, particularly in the context of engineering and technology. It represents the average time elapsed between inherent failures of a system during operation. This metric is crucial in evaluating how long a system can function before experiencing a failure, thereby indicating its reliability over time.

Using MTBF as a measure allows organizations to predict maintenance schedules and downtime accurately, as well as to assess the performance and durability of systems over their operational life. A higher MTBF indicates a more reliable system, as it suggests that failures occur less frequently, leading to improved performance and lower operational costs.

In contrast, other options like MTTR (Mean Time to Repair) focus on how quickly a system can be repaired after failure, making it a measure of maintainability rather than reliability. RTT (Round Trip Time) is mainly associated with network latency and does not pertain to system reliability, and CPU (Central Processing Unit) references a hardware component without a direct focus on reliability metrics. These distinctions clarify why MTBF is the most appropriate choice for assessing system reliability.