Cloud Guard detected a risk score of zero in the dashboard, what does this mean ?

You create a new compartment, "apps," to host some production apps and you create an apps_group and added users to it.
What would you do to ensure the users have access to the apps compartment?
You are using a custom application with third-party APIs to manage application and data hosted in an Oracle Cloud Infrastructure (OCI) tenancy. Although your third-party APIs don't support OCI's signature-based authentication, you want them to communicate with OCI resources. Which authentication option must you use to ensure this?
Operations team has made a mistake in updating the secret contents and immediately need to resume using older secret contents in OCI Secret Management within a Vault.
As a Security Administrator, what step should you perform to rollback to last version? Select TWO correct answers.

Which volume type contains the image used to boot a compute instance?