Which of the following statements about a serial port are true?
Each correct answer represents a complete solution. Choose all that apply.

A.
It is used to connect a printer and a scanner to a computer.

B.
It sends data one bit at a time, over a single wire.

C.
It has 9-pin and 25-pin connectors on personal computers.

D.
It sends data eight bits at a time, over a single wire.

Explanation:
Answer options B and C are correct.
Serial port is the primary means for connecting modems and mouse to a computer. There are two
types of serial port connectors, 9-pin and 25-pin. The word serial refers to the that data is sent in
series, one bit at a time, over a single wire. This design is significantly slower than sending 8 bits at a
time via a parallel channel, but serial signals can travel much farther without degradation.
Reference: TechNet, Contents:” The Road to USB. Tracking the Next Peripheral Communications
Channel”