What voice endpoint is recommended for use with the Cisco Unified Communications 500 Series for small businesses？（）

A. Catalyst 2800/E Series
B. Catalyst 3750 Series
C. Catalyst 3900/E Series
D. Catalyst 4500/E Series
E. Catalyst 6500/E Series

A.integrates data，security，and wireless
B.integrates data，ecurity，wireless and application optimization
C.integrates voice，data，security，wireless and application optimization
D.integrates data and wireless

A.Cisco Intrusion Prevention System
B.Cisco IOS Software Firewall
C.Cisco IOS Easy VPN
D.Cisco Unified Wireless Networking
E.Cisco ASA Hardware Firewall