What are three functions of the Cisco wireless LAN controller， which is being used in the Company Centralized WLAN solution network？ （）

A、Authentication
B、Mobility
C、Securitymanagement
D、Transmissionofbeaconframes
E、Real-timeportionsofMACmanagement
F、Real-timeaspectsofthe802.11prtocolmanagementG、SNMPcollectio