Answer is a) Latency Monkey
Reason : Latency Monkey added delays in RESTful client-server communications and while it proved to be a useful tool. However, as Netflix later discovered, this particular Simian could be somewhat difficult to wrangle at times. Latency Monkey helps in validating if the server can handle degradation.
By simulating network delays and failures, it allowed services can be tested to see how they react when their dependencies slow down or fail to respond, but these actions also occasionally caused unintended effects within other applications.
