You want to re-architect a monolithic application so that it follows a microservices model. You want to accomplish this efficiently while minimizing the impact of this change to the business. Which approach should you take? 

Answer options:

A. Deploy the application to Compute Engine and turn on autoscaling.
B. Replace the application`s features with appropriate microservices in phases.
C. Refactor the monolithic application with appropriate microservices in a single effort and deploy it.
D. Build a new application with the appropriate microservices separate from the monolith and replace it when it is complete.

C

Reference: https://cloud.google.com/solutions/migrating-a-monolithic-app-to-microservices-gke