Why are intermittent faults challenging to diagnose?

Intermittent faults are particularly challenging to diagnose because they only manifest under specific conditions and can disappear when attempts are made to observe them. This unpredictability makes it difficult for technicians or engineers to pin down the exact nature of the fault, as they may not be able to witness the fault occurring during diagnostic testing or when tools are applied.

This characteristic of intermittent faults requires a more nuanced approach to troubleshooting, often involving longer observation periods or more sophisticated diagnostic techniques to capture the fault in action. The sporadic nature and reliance on certain triggers make them elusive, complicating the diagnosis compared to faults that are constant or predictable in their behavior.

The other options present scenarios that do not align with the inherent nature of intermittent faults, as they imply relative ease in identification and constant visibility, which is not the case for these types of faults.