Select the alternative that contains the three main components of a telephone network. a. NID, PSTN, and switching centers. b. Local loop, PSTN, ...

Select the alternative that contains the three main components of a telephone network.


a. NID, PSTN, and switching centers.
b. Local loop, PSTN, and switching centers.
c. Local loop, trunks, and switching centers.
d. Local loop, PSTN, and trunks.
e. PSTN, trunks, and switching centers.