Which of the following is an important success factor for any significant automation project?

For any significant automation project, a critical success factor is that the System Under Test (SUT) must be designed for testability (Option C). Testability refers to the ease with which a system can be tested, which includes aspects like accessibility to test interfaces, observability of outputs, controllability of inputs, and the system's ability to be put into a known state for testing. A SUT designed with testability in mind facilitates the creation and execution of automated tests, enhancing the effectiveness, reliability, and coverage of the Test Automation Architecture (TAA). This design consideration directly impacts the efficiency of testing activities, reducing the time and effort required to achieve comprehensive test coverage and identify defects.