What is the initial suggestion a Solution Architect should provide to make Partner Communities work for UC?

Universal Containers (UC) currently utilizes Sales Cloud and Experience Cloud for its customers. For the next phase in its digital transformation, UC would like to enable its vast dealer network with the kinds of tools its direct Sales teams are currently using. UC is considering Partner Communities (PRM) on Experience Cloud. UC’s concern at the moment is making sure that its dealer network only gets access to the opportunities they themselves bring to UC or that UC submits to the dealer to close. This is a concern for the VP of direct sales who has issues with bringing PRM in at all.

What is the initial suggestion a Solution Architect should provide to make Partner Communities work for UC?
A . Create two account lookups on the opportunity, one for dealer and one for partner company, and create sharing rules to share the records.
B. Create public groups of partner companies and users at dealers, and share the opportunities using sharing rules.
C. Utilize the external sharing model to differentiate the sharing models between Internal Sales users and External Communities users.
D. Utilize the same sharing model within the Partner Community that customers are currently using within the Customer Community.

Answer: C