Your application performs well when tested locally, but it runs significantly slower when you deploy it to App Engine standard environment. You want to diagnose the problem. What should you do? 

Answer options:

A. File a ticket with Cloud Support indicating that the application performs faster locally.
B. Use Stackdriver Debugger Snapshots to look at a point-in-time execution of the application.
C. Use Stackdriver Trace to determine which functions within the application have higher latency.
D. Add logging commands to the application and use Stackdriver Logging to check where the latency problem occurs.

D