Systems analysts use an unit test to verify that all programs in an application work together properly. So the answer is a. unit
Unit testing is a type of software testing that tests individual units or components of the software. Its purpose is to verify that each unit of software code is working as expected.
Unit tests are run by the developer during application development (coding phase). Unit tests isolate sections of code and verify their correctness. Units can be functions, methods, procedures, modules or individual objects.
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