In each of the following exercises, select the ONE answer that BEST
completes the statement or answers the question.
Indicate your solution by
circling the letter opposite the correct answer in the subcourse booklet.
1. A complete telephone communication system my include short- and long-
distance networks. One difference between these two types of networks is that
the long-distance network includes
b. telephones and switchboards.
d. telephone carrier systems end switchboards.
2. At each point of conversion from two-wire to four-wire circuits, it is
always necessary to insert a