What is used for implementing the changes in existing or new requirements of user in software mainte ce?

What is used for implementing the changes in existing or new requireme

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1.	What is used for implementing the changes in existing or new requirements of user in software mainte ce?
A.	Preventive mainte ce
B.	Perfective mainte ce
C.	Corrective
D.	Adaptive
Answer» C. Corrective