You work as a network administrator at ABC.com. The ABC.com network consists of an Active Directory Domain Services domain named ABC.com. All servers on the network run Windows Server 2008 R2. The client computers run Windows 7 Enterprise.

The network includes 10 servers that run the Remote Desktop Session Host (RD Session Host) role.

A server named ABC-RDLicensing runs the Remote Desktop Licensing role and has 200 Remote Desktop Services client access licenses (RDS CALs) installed.

You are planning to deploy 20 new Windows 7 client computers to the network.

You notice that the pool of RDS CALs is getting low. You want to return 20 RDS CALs to the license pool to accommodate the new client computers.

How can you return 20 RDS CALs to the license pool?

A.
By rebooting 20 client computers that have Per Device RDS CALs.

B.
By logging off 20 users that have Per User RDS CALs.

C.
By reinstalling 20 RDS CALs.

D.
By revoking 20 Per User RDS CALs.

E.
By revoking 20 Per Device RDS CALs.