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You are deploying an application on Google App Engine that needs to connect to a private, on-premises database. The database must not be exposed to the public internet for security reasons. What is the recommended solution?
A
Deploy your application on App Engine standard environment and use App Engine firewall rules to limit access to the open on-premises database.
B
Deploy your application on App Engine standard environment and use Cloud VPN to limit access to the on-premises database.
C
Deploy your application on App Engine flexible environment and use App Engine firewall rules to limit access to the on-premises database.
D
Deploy your application on App Engine flexible environment and use Cloud VPN to limit access to the on-premises database.
