Which of these should a change model include?
1. The steps that should be taken to handle the change
2. Responsibilities; who should do what, including escalation
3. Timescales and thresholds for completion of the actions
4. Complaints procedures

A.
1, 2 and 3 only

B.
All of the above

C.
1 and 3 only

D.
2 and 4 only