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Your application relies on a licensing server that must be accessible at the fixed IP address 10.0.3.21. You need to deploy this licensing server on Google Compute Engine while ensuring the application's configuration remains unchanged. How should you achieve this?
A
Reserve the IP 10.0.3.21 as a static internal IP address using gcloud and assign it to the licensing server.
B
Reserve the IP 10.0.3.21 as a static public IP address using gcloud and assign it to the licensing server.
C
Use the IP 10.0.3.21 as a custom ephemeral IP address and assign it to the licensing server.
D
Start the licensing server with an automatic ephemeral IP address, and then promote it to a static internal IP address.
Explanation:
The correct answer is A. The IP address 10.0.3.21 falls within the private IP range (10.0.0.0/8) and must be reserved as a static internal IP address to ensure it does not change. This allows your application to reliably reach the licensing server at this internal IP address without requiring any configuration changes.