Discussion
Which of the following is a type of software maintenance ?
Answer: D
The answer is All of the above.
Software maintenance is usually classified into corrective maintenance (fixing faults found after delivery), adaptive maintenance (changing the software to work in a new environment, such as a new operating system), perfective maintenance (improving performance or adding requested features) and preventive maintenance.
All three named in the options are recognised types, so no single one is the complete answer.
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