What is a test hook?

What is a test hook?
A . A tool that provides an environment for test automation
B. A tool to automate comparison of actual results with expected results
C. A customized software interface that enables automated testing of a System Under Test (SUT)
D. The degree to which tests can be designed and executed

Answer: C

Explanation:

A test hook is a software interface that enables automated testing of a System Under Test (SUT). It is used to interact with the SUT, for example, by sending inputs and receiving outputs, in order to verify its behavior. A test hook can be customized to suit the specific needs of the SUT and the tests being performed.