Answer: Both Technician A and Technician B are correct.
Explanation:
Multiplexing system makes communication within several separate modules possible via the use of one (or two wires). In this case, the data bus has a single wire. Therefore, Technician B is correct.
Also, the data backbone of a multiplex system which is called a twisted wire pair chapter consist of twisted pair of wires which are thus twisted in order to reduce the susceptibility of EMI. So Technician B is also correct.