Demultiplexers are also called asa.data distributerb.serial-to-parallel converterc.Both (a) and (b)

Demultiplexers are also known as both (a) data distributer and (b) serial-to-parallel converter.

Here's why:

a) Data Distributer: A demultiplexer functions as a data distributer in that it takes a single input line and then routes it to one of several digital output lines.

b) Serial-to-Parallel Converter: A demultiplexer can also function as a serial-to-parallel converter. In this case, it takes a bit-serial input and converts it to a bit-parallel output. This is done by distributing the input to the appropriate output line.

So, the answer is c. Both (a) and (b).