What is the purpose of a switch?

A.
A switch is a device that enables a computer to communicate with other computers over
telephone lines by translating digital data into audio/analog signals, and then back into digital form.

B.
A switch is a device that directs the flow of information from one node to another.

C.
A switch is a device that terminates physical connections.

D.
A switch is a device that converts one protocol stack to another.