Answer: Provision Cloud KMS in its own project., Grant an owner role for the Cloud KMS project to a different user than the owner of the project where the keys from Cloud KMS are being used.

The question requires adhering to the 'separation of duties' principle and Google's best practices for Cloud KMS. - **Option A** is correct because provisioning Cloud KMS in its own project isolates key management, allowing stricter access controls and reducing the risk of unintended access to keys. This aligns with Google's recommendation to centralize key management in a dedicated project. - **Option E** is correct because assigning a different owner for the Cloud KMS project ensures that the management of keys (KMS project owner) is separate from the usage of keys (application project owner), enforcing separation of duties. - **Option C** is incorrect because co-locating KMS in the same project as resources using keys risks combining access, violating separation of duties. - **Options B and D** are incorrect: projects require at least one owner (B is invalid), and granting cloudkms.admin to the application project owner (D) would centralize control, conflicting with separation of duties. - **Option E** directly addresses the separation by ensuring distinct ownership.

Author: LeetQuiz Editorial Team