Which configuration should they choose?

HipLocal wants to improve the resilience of their MySQL deployment, while also meeting their business and technical requirements.

Which configuration should they choose?
A . Use the current single instance MySQL on Compute Engine and several read-only MySQL servers on
Compute Engine.
B . Use the current single instance MySQL on Compute Engine, and replicate the data to Cloud SQL in an
external master configuration.
C . Replace the current single instance MySQL instance with Cloud SQL, and configure high availability.
D . Replace the current single instance MySQL instance with Cloud SQL, and Google provides redundancy without further configuration.

Answer: B