How many bearer channels does a BRI ISDN service have?

A.
23

B.
24

C.
2

D.
1

Explanation:
Basic rate interfaces (BRI) ISDN service provides two bearer, or B
channels, and one D or control channel. Data is transferred over B channels and the
call setup, maintenance, and teardown take place over the D channel. PRI ISDN
service provides 23 B channels and one D channel.