What must be configured to correct this?

An organization is hosting a conference and must make guest accounts for several of the speakers attending. The conference ended two days early but the guest accounts are still being used to access the network .

What must be configured to correct this?
A . Create an authorization rule denying sponsored guest access.
B . Navigate to the Guest Portal and delete the guest accounts.
C . Create an authorization rule denying guest access.
D . Navigate to the Sponsor Portal and suspend the guest accounts.

Answer: D