Explanation:
The correct answer is D because Google App Engine Flexible environment supports Cloud VPN, which is necessary for connecting to an on-premises database. App Engine Standard does not support Cloud VPN, making options A and C incorrect. While Cloud Router is useful for dynamic routing, it does not provide the VPN connectivity required for accessing on-premises resources, making option B incorrect. For detailed network configuration and VPN setup, refer to the GCP documentation on App Engine Flexible Network Settings.
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A company is planning to migrate their web application to Google App Engine but intends to keep using their on-premises database. What is the best way to set up the application?
A
Set up the application using App Engine Standard environment with Cloud VPN to connect to the database
B
Set up the application using App Engine Flexible environment with Cloud Router to connect to the database
C
Set up the application using App Engine Standard environment with Cloud Router to connect to the database
D
Set up the application using App Engine Flexible environment with Cloud VPN to connect to the database