Which three statements are true about load-based Call Admission Control?（）

• A、grants a VoWLAN client-initiated call based on the number of active clients associated to the accesspoint
• B、grants a VoWLAN client-initiated call based on channel bandwidth capacity
• C、uses the 802.11i specification
• D、uses 802.11 action frames
• E、requires a WMM-enabled client