Which Cisco solution enables face-to-face communications and can, therefore, save expenses on busine

Which Cisco solution enables face-to-face communications and can, therefore, save expenses on business travel?

A.
Cisco Unified IP Phone 7900 Series

B.
Cisco WAP200 Wireless-G Access Point

C.
Cisco Unified IP Phone 8900 Series

D.
Cisco Aironet Access Point

E.
Cisco SPA Series IP Phone

Explanation: