You support a web application that is hosted on Compute Engine. The application provides a booking service for thousands of users. Shortly after the release of a new feature, your monitoring dashboard shows that all users are experiencing latency at login. You want to mitigate the impact of the incident on the users of your service. What should you do first? 

Answer options:

A. Roll back the recent release.
B. Review the Stackdriver monitoring.
C. Upsize the virtual machines running the login services.
D. Deploy a new release to see whether it fixes the problem.

C