Which Technique Is Most Likely to Facilitate the Deletion of Every

Which technique is most likely to facilitate the deletion of every instance of data associated with a deleted user account from every data store held by an organization?

A) Auditing the code which deletes user accounts.
B) Building a standardized and documented retention program for user data deletion.
C) Monitoring each data store for presence of data associated with the deleted user account.
D) Training engineering teams on the importance of deleting user accounts their associated data from all data stores when requested.