Which of the following is an example of a multiplexing advantage?

Question $40$ options:

It improves telegraph signaling. Since we no longer use a telegraph, multiplexing is no longer of much importance in Data Communications

It reduces the cost of laying a cable

It allows a single data link to carry multiple, effectively simultaneous messages.

It allows us to install a bundle of $200$ cables into a single neighborhood, thus supporting up to $200$ channels