Final answer:
The incorrect statement regarding system reliability is that it is not affected by external factors; in fact, reliability is influenced by factors such as environment, user errors, and operational changes. Redundancy and maintenance are important in enhancing and maintaining system reliability.
Step-by-step explanation:
The statement pertaining to system reliability that is not true is "System reliability is not affected by external factors." System reliability is indeed influenced by external factors such as environmental conditions, user errors, and changes in the operational context or requirements. Statements A, B, and D all reflect true aspects of system reliability.
- System reliabilityis the ability of a system to perform its required functions under stated conditions for a specified period of time.
- Redundancy can enhance system reliability by providing backup components that can take over if the primary ones fail.
- Regular maintenance ensures that systems operate without unexpected failures and contributes to overall system reliability.
Contrary to statement C, system reliability is susceptible to and often compromised by external factors. Adequate measures, including environmental protections and error prevention protocols, need to be in place to shield the system from such impacts and maintain its reliability.