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Emergency fixes known as patches are result of

2. Perfective maintenance
3. Corrective maintenance
4. None of the above

ans is C

Corrective maintenance is a maintenance task performed to identify, isolate, and rectify a fault so that the failed equipment, machine, or system can be restored to an operational condition within the tolerances or limits established for in-service operations.

Emergency fixes is known as patching nd this is use in corrective

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