With the volume of communication that can happen between different components in cloud-native applications, it is vital to not only test functionality, but also service resiliency. Which statement is true with regards to service resiliency? (Choose the best answer.) 

Answer options:

A. Resiliency is about recovering from failures without downtime or data loss.
B. A goal of resiliency is not to bring a service to a functioning state after a failure.
C. Resiliency testing can be only done in a test environment.
D. Resiliency is about avoiding failures.

D