Question

Most data communications involving telegraph lines use:
A.simplex lines
B.wideband channels
C.narrowband channels
D.dialed service

Answer 1

Option b is correct so you tick

Answer 2

Narrowband channel describes the bandwidth of a channel in which the message cannot exceed the coherence of the bandwidth of the channel.

Therefore, the most data communications that include the telegraph lines mainly use the narrow band channels.

Therefore, the right answer of the given question is option C.

Narrow band channels. Because it will not exceed or cross the limit of the channel.