What is the recommended solution to configure this?

Universal Containers is rolling out a new customer service process. Customer service managers will need to edit cases for their subordinates, but not cases for other groups. Managers and users should be able to view all cases .

What is the recommended solution to configure this? Choose 2 answers
A . Create standard role hierarchies
B . Set organization-wide sharing defaults to public read/only.
C . Create criteria-based sharing rules.
D . Set organization-wide sharing defaults to private.

Answer: A,B