Adaptive maintenance is a maintenance which ............. (A) Correct errors that were not discovered till testing phase. (B) is carried out to port the existing software to a new environment. (C) improves the system performance. (D) both (B) and (C)

Adaptive maintenance is a maintenance which ............. (A) Correct errors that were not discovered till testing phase. (B) is carried out to port the existing software to a new environment. (C) improves the system performance. (D) both (B) and (C)
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(B) is carried out to port the existing software to a new environment.
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