You are employed as a developer at ABC.com. You have been instructed to create a new program
for ABC.com.
You want to make sure that when you fix a problem with the program, it does not negatively affect
the rest of the program.
You need to employ a suitable testing strategy.
What option should you use?

A.
Merger.

B.
Improvement.

C.
Rejection.

D.
Regression.