The Cisco Smart Business Communications System offers support of third-party applications. When using TimeCard View， what device is used by employees to clock in and clock out？（）  

A. technical support that requires an annual subscription
B. management consultancy service offered to develop partner business process
C. support for partners building a new business
D. program to develop Unified Communications practice

A. allows multiple access points to be connected wirelessly， without the need for a wired Ethernet network
B. replicates configuration parameters across access points in the cluster， while optimizing network performance
C. automatically configures wireless client devices via Wi-Fi Protected Setup
D. can get real-time traffic or bandwidth statistics from an access point within a cluster

A. Mobility Services Engine
B. WLAN controller
C. Cisco Wireless Control System
D. rugged/exterior access points
E. interior access points