Your company has an Active Directory Domain Services (AD DS) domain. You have multiple Remote Desktop Session Host (RD Session Host) servers. You have 100 Windows Server 2008 R2 Remote Desktop Services client access licenses (RDS CALs) installed on your license server. You need to return 10 RDS CALs to the pool on the license server. What should you do?（）

• A、Remove the Per User RDS CALs.
• B、Revoke the Per Device RDS CALs.
• C、Remove the Per Device RDS CALs.
• D、Revoke the Per User RDS CALs.