Which of the following items would commonly be on the agenda for a change advisory board (CAB)? 1. Details of failed changes 2. Updates to the change schedule 3. Reviews of completed changes

All three items are recognized CAB agenda elements in ITIL change management: details of failed changes enable root cause analysis and process improvement; updates to the change schedule (Forward Schedule of Change) keep stakeholders aligned on upcoming activity; and reviews of completed changes provide post-implementation validation and capture lessons learned. Omitting any one of these weakens the CAB's governance function.

Excluding reviews of completed changes (item 3) removes post-implementation review from the CAB, which is a key quality and learning activity in ITIL change management.

Excluding details of failed changes (item 1) prevents the CAB from analyzing failures and driving process improvements, which is a core CAB responsibility.

Excluding updates to the change schedule (item 2) leaves the CAB without current scheduling information needed to assess conflicts and prioritize upcoming changes.