Which sharing option should the Salesforce Administrator choose to meet the requirement for internal users?

Universal Containers recently rolled out a Community to its partners.

The internal sales team has the following requirements:

– Ability to support the addition of 50 new partners every month.

– Ability to pass leads to the partners.

– Continue to have access to the leads after transfer to a partner.

– Access to the Opportunity when the partner converts the lead.

– Leads should be visible to only the partner who is working on the lead.

Which sharing option should the Salesforce Administrator choose to meet the requirement for internal users?
A . Allow partner users to manually share the Leads and Opportunities with internal users.
B . Use Sharing Sets to share Leads and Opportunities so internal users can automatically access those records.
C . Set OWD (Organization-Wide Default) to Private, create a sharing rule for Leads and Opportunities, and implement the Lead Inbox component.
D . Create Lead and Opportunity Sharing Rules that share those records to a public group of partner users.