What two things should a Salesforce Admin do to accomplish this?

Universal Containers needs to create a Support Community with the following requirements:

– Customer and partner users will be members of this community and use the Customer Community and Partner Community License, respectively.

– A customer user should be able to see all cases opened for their account, including cases opened by their colleagues.

– Customer users must be able to collaborate with all Community users.

What two things should a Salesforce Admin do to accomplish this? (Choose two.)
A . Create a Sharing Set on the Case object.
B . Enable Super User access for customer users.
C . Set up Delegated Admin access for customer users.
D . Select the Community User Visibility checkbox.

Answer: BD