Which two statements about the wireless control system （WCS） are true？（）

• A、the Cisco WCS is designed to support 1500 Cisco WLAN controllers and up to 50 APs
• B、the Cisco WCS runs on a dedicated network device such as the Cisco 2700 network appliance
• C、the Cisco WCS runs on various windows and Linux platforms
• D、the Cisco WCS screen displays four main menu sheet tab consisting of Monitor， Configure， Security， and Alam
• E、the Cisco WCS uses the SNMP protocol to communicate with the controllers