Which two Cisco series of IP phone, doc. the Cisco Unified Communications 300 Series support?
(Choose two)

A.
Cisco Unified SIP Phone 3900 Series

B.
SPA300 Series IP Phones

C.
Cisco Unified IP Phones 6900 Series

D.
Cisco Unified IP Phones 7900 Series

E.
SPA500 Series IP Phones

Explanation: