You are writing a shell script that includes a few gcloud CLI commands to access...

Comprehensive and Detailed Explanation From Exact Extract:

To adhere to the most secure way and Google-recommended practices, you must avoid the creation and handling of service account key files.

Option B (Impersonation): This method allows the currently logged-in user to temporarily assume the identity and permissions of the service account. It is keyless, meaning no long-lived secret is downloaded or stored on the local machine, drastically improving security. The gcloud config command sets this behavior for all subsequent gcloud commands in the session.