Final answer:
Corrective maintenance is the type of maintenance responsible for diagnosing and fixing errors in an operational system, ensuring its proper functioning. Option a is correct..
Step-by-step explanation:
The type of maintenance that diagnoses and fixes errors in an operational system is known as corrective maintenance. This maintenance type deals directly with the identification and correction of faults or defects in a system to ensure that it operates correctly. Adaptive maintenance involves making changes to a system to allow it to operate in a changed environment. Perfective maintenance focuses on improving the performance or maintainability of a system, often by enhancing its features. Lastly, preventive maintenance aims to prevent the occurrence of errors by performing updates and checks before problems arise.
Corrective maintenance diagnoses and fixes errors in an operational system. This type of maintenance is performed when a problem is identified and needs to be immediately addressed to restore the system to its normal functioning.
For example, if a computer program crashes frequently or a hardware component fails, corrective maintenance is required to identify the cause of the issue and fix it so that the system can operate correctly.