concentrator
RS-232C port
multiplexer
communications processor E. None of the above
Answer is Right!
Answer is Wrong!
The correct answer is: D. communications processor.
A communications processor is a hardware device that acts as both a switching and connecting unit. It is used to connect multiple devices to a communication network, and to switch data between them.
A concentrator is a device that connects multiple devices to a single communication line. It does not switch data between devices, but rather passes data from one device to the next.
An RS-232C port is a type of serial port that is used to connect devices to a computer. It is not a switching or connecting unit.
A multiplexer is a device that combines multiple signals into a single signal. It is not a switching or connecting unit.
E is not the correct answer because it is not a valid option.