When should you deactivate entitlements?

You are a Dynamics 365 for Customer Service administrator.
You need to deactivate entitlements.
When should you deactivate entitlements? Each correct answer presents a complete solution.
NOTE: Each correct selection is worth one point.
A. A customer’s entitlement has ended and no more support is desired.
B. A customer renews an entitlement for 100 more hours or one year.
C. A customer calls and wants to know how many hours of support remain.
D. The customer must change remaining support hours from all email support to one-half email support and one-half phone support.
E. You need to add notes to the customer’s entitlement.