Which two of the following VoIP gateway platforms are considered to be Integrated Services Routers (ISRs)?

Which two of the following VoIP gateway platforms are considered to be Integrated Services Routers (ISRs)? (Choose 2.)

A.
Cisco 2600XM Series

B.
Cisco 2800 Series

C.
Cisco 3700 Series

D.
Cisco 3800 Series