What are the four horizontal layers of the gTAA?

What are the four horizontal layers of the gTAA?
A . Test adaptation, test execution, test design, test definition
B. Test generation, test execution, test definition, test APIs
C. Test generation, test definition, test execution, test adaptation
D. Test definition, test execution, test reporting, test adaptation

Answer: C

Explanation:

The gTAA is a reference architecture for test automation systems, and it is organized into four layers to separate different concerns. Each layer has its own responsibilities and interacts with the others to form a complete test automation system. The Test Generation layer is for creating test cases, the Test Definition layer is for defining those cases and their data, the Test Execution layer is for running the test cases, and the Test Adaptation layer handles interactions between the test automation system and the system being tested.