You need to write a new policy for Vault for a group of users on...

Comprehensive and Detailed In-Depth Explanation:

Templated policies with {{identity.entity.id}} provide user-specific access. The Vault documentation states:

"This policy would permit all current and future users with a custom path based on their entity IDwhen they log into Vault using a variable replacement within the path. Templated policies allow policy authors to create policies that can dynamically adjust based on attributes of the identity requesting access."

—Vault Policies: Templated Policies

D: Correct. Uses entity ID for private sections with minimal effort:

"By using {{identity.entity.id}}, each user gets access to their own private section, minimizing administrative effort as new users automatically get their own path."

—Vault Policies: Templated Policies

A: Group-based and only lists, not manages.

B: Hardcodes users, not scalable.

C: Grants all users access to all secrets, violating least privilege.