Which two approaches are recommended to meet their requirement?

Universal Containers is rolling out a new opportunity review process. Regional managers will need to edit opportunities for their subordinates, but not for other groups. Managers and users should be able to view all opportunities.

Which two approaches are recommended to meet their requirement? (Choose two.)
A . Set organization-wide defaults to public read/only.
B . Create standard role hierarchies
C . Set organization-wide defaults to public read/write.
D . Create criteria based sharing rules.

Answer: AB