How might the Architect design the solution to federate user setup to the Partners?

Universal Containers has a large network ofpartners, who each have seasonal workers that need ..

How might the Architect design the solution to federate user setup to the Partners? Choose 2 answers
A . Assign delegated external administrators at each partner.
B. Grant the Modify Users permission tothe partner managers.
C. Allow external users to self register.
D. Create a permission set giving Read/Write to the User object to partner manager.

Answer: A,C