When configuring QoS on a wireless controller， the per-user， real-time bandwidth contract isenforced for which of the following protocols？（）

A.14
B.15
C.17
D.16

A.Location Appliance
B.controller-based access points
C.wireless clients
D.Wireless Control System
E.wireless controllers

A.4 to 6 times the tag beaconing rate
B.10 to 12 times the tab beaconing rate
C.8 to 10 times the tag beaconing rate
D.6 to 8 times the tag beaconing rate