Which of the following technologies is used to connect public networks using POTS lines?

A.
OC3

B.
OC12

C.
PSTN

D.
Cable

Explanation:
The PSTN consists of telephone lines, fiber optic cables, microwave
transmission links, cellular networks, communications satellites, and undersea telephone cables,
all interconnected by switching centers, thus allowing any telephone in the world to communicate
with any other