Which license type should a Salesforce Administrator use for these Partner users?

Universal Containers needs to create a Community that meets the following requirements:

– Self-Service Support Community, in which customer and partner users are community members.

– Partner users help Universal Containers by adding or resolving cases for their customers within the Community.

– Partner users need access to some standard objects except Leads, Campaigns, and Opportunity objects.

– Partners use Chatter and the Case Feed to communicate with the Universal Containers team and customers.

Which license type should a Salesforce Administrator use for these Partner users?
A . Employee Community license
B . Customer Community Plus license
C . Customer Community license
D . Partner Community license