How should HipLocal increase their API development speed while continuing to provide the QA team with a stable testing environment that meets feature requirements?

For this question, refer to the HipLocal case study.

How should HipLocal increase their API development speed while continuing to provide the QA team with a stable testing environment that meets feature requirements?
A . Include unit tests in their code, and prevent deployments to QA until all tests have a passing status.
B . Include performance tests in their code, and prevent deployments to QA until all tests have a passing status.
C . Create health checks for the QA environment, and redeploy the APIs at a later time if the environment is unhealthy.
D . Redeploy the APIs to App Engine using Traffic Splitting. Do not move QA traffic to the new versions if errors are found.

Answer: B