The correct answer is RBAC.
RBAC allows you to assign specific roles like Key Vault Contributor, which grants the user the ability to set advanced access policies, ensuring access based on the principle of least privilege.
Azure Information Protection focuses on data classification, labeling, and protection, not managing access to Azure Key Vault.
While Azure AD Privileged Identity Management offers time-based and approval-based role activation, it doesn't directly manage access to Azure Key Vault or allow setting advanced access policies for it.
Azure DevOps is primarily a set of services for software development, not for managing access to Azure Key Vault.
https://learn.microsoft.com/en-us/azure/key-vault/general/security-features