单项选择题

Which companion switch is recommended to be installed with Cisco Smart Business Communications System？（）

A. C2950
B. C3750
C. ESW 500
D. SRW224G4

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多项选择题

Cisco Catalyst 4500 Series switches are attractive to medium-size campuses with growth opportunities due to the switches enhanced security and which two other features？（）

A. enhanced multilayer software image
B. connectivity to multiple types of WAN connections
C. Cisco Unified Communications Manager
D. QoS for converged networks
E. modular， customizable components