As users switch roles within an organization, their accounts are given additional permissions to perform the duties of their new position. After a recent audit, it was discovered that many of these accounts maintained their old permissions as well. The obsolete permissions identified by the audit have been remediated and accounts have only the appropriate permissions to complete their jobs.
Which of the following is the BEST way to prevent access privilege creep?

A. Implementing Identity and Access Management (IAM) solution
B. Time-based review and certification
C. Internet audit
D. Trigger-based review and certification