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Google Cloud Certified Associate Cloud Engineer · Google Cloud
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OS Login Feature: OS Login is a feature in GCP that manages SSH access to your Compute Engine instances using IAM (Identity and Access Management) roles. When OS Login is enabled, it allows you to use IAM roles to grant or revoke SSH access to your instances, which can be more secure and manageable than traditional SSH key management. Enabling OS Login: Setting the instance metadata enable-oslogin=true enables the OS Login feature on that specific Compute Engine instance. When OS Login is enabled, traditional SSH keys defined in the project or instance metadata are ignored, and the instance instead relies on IAM roles for SSH access.
A is correct as , it gives the only specific access
https://cloud.google.com/compute/docs/oslogin/set-up-oslogin