Go back to 640-460 - IIUC Implementing Cisco IOS Unified Communications (IIUC)

Question :-

A PRI (Primary Rate Interface) is a telecommunication standard used in the Integrated Services Digital Network or ISDN, for carrying multiple DS0 voice and data transmissions between two physical locations. PRI was developed specifically for industrial or large quantity users. PRI is an industrial ISDN line while the Basic Rate Interface, or BRI, is used to cater to home and small enterprises. Which three characteristics apply to ISDN PRI? (Choose three.)
PRI offers 20 B channels and 1 D channel
the D channel is 64 kbps
can carry data, voice, or video
can carry vendor-specific PBX features

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