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

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.
A . Create a Sharing Set on the Case object.
B . Enable Super User access for customer users.
C . Select the Community User Visibility checkbox.
D . Set up Delegated Admin access for customer users.

Answer: B,C