Concept:A modem is a device that converts digital signals used by a computer into analogue signals suitable for telephone lines, and vice versa.
Explanation:The diagram shows computer A connected to modem X through a local cable.
Signals sent from computer A to modem X have not yet passed through the telephone network.
Computers process and transmit data as digital signals, which consist of discrete 0s and 1s.
Modem X receives these digital signals and converts them into analogue signals before transmitting them over the telephone line.
At the receiving end, another modem converts the analogue signals back into digital signals for computer B.
Since the signal is being sent from the computer to the modem, it is still in digital form.
Thus, the signals from A to modem X are not analogue, electrons, or protons.
Answer:B. digital
