Which additional testing methods should the developers employ to prevent an outage?

Dress4Win has end-to-end tests covering 100% of their endpoints.

They want to ensure that the move to the cloud does not introduce any new bugs.

Which additional testing methods should the developers employ to prevent an outage?
A . They should enable Google Stackdriver Debugger on the application code to show errors in the code.
B . They should add additional unit tests and production scale load tests on their cloud staging environment.
C . They should run the end-to-end tests in the cloud staging environment to determine if the code is working as intended.
D . They should add canary tests so developers can measure how much of an impact the new release causes to latency.

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Answer: B