Which policy can be attached to a vault to control its access?

The vault access policy is specifically designed to manage and control access to a vault in scenarios such as Azure Key Vault. This policy establishes permissions for different users or applications, allowing you to define who can perform various operations within the vault, such as reading secrets, writing keys, or performing other sensitive actions.

This level of granularity is crucial for maintaining security standards and ensuring that only authorized entities can interact with the data stored within the vault. By attaching a vault access policy, organizations are able to maintain a robust access management framework that aligns with best practices for identity and access governance.

Other policies mentioned, while they may have their specific uses in different contexts, do not provide the targeted access control directly associated with vault functionalities as the vault access policy does. Therefore, focusing on the vault access policy is essential for effective access management in the context of vaults.