What is the purpose of the Cisco ISE Guest Service Sponsor Portal?

What is the purpose of the Cisco ISE Guest Service Sponsor Portal?

A.
It tracks and stores user activity while connected to the Cisco ISE.

B.
It securely authenticates guest users for the Cisco ISE Guest Service.

C.
It filters guest users from account holders to the Cisco ISE.

D.
It creates and manages Guest User accounts.