Answer:
Option A is correct.
The process of making changes to an information system to evolve its functionality, to accommodate changing business needs, or to migrate it to a different operating environment is known as adaptive maintenance.
Explanation:
"Adaptive Maintenance" as obvious from the name are the changes or modifications that are implemented whenever the system is affected by any kind of change.
Whenever a process adapts itself to the change in outer system, in order to perform in a better way, this is termed as adaptive maintenance .
This can be of great value as the working of the whole system depends on the maintenance so that it may becomes better than better.
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