How should the customer ensure authenticated network separation between the different tiers of the application?

A customer wants to deploy a large number of 3-tier web applications on Compute Engine.

How should the customer ensure authenticated network separation between the different tiers of the application?
A . Run each tier in its own Project, and segregate using Project labels.
B. Run each tier with a different Service Account (SA), and use SA-based firewall rules.
C. Run each tier in its own subnet, and use subnet-based firewall rules.
D. Run each tier with its own VM tags, and use tag-based firewall rules.

Answer: C

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