It uses a series of filters to decompose the multiplexed signals into its constituent component signals. a. Demodulator b. Demultiplexer c. Multiplexer d. Guard bands

b) Demultiplexer.

Explanation:

The multiplexed signal occupies the total bandwidth of the communications channel, while that the constituent component signals, occupy only a small part of the bandwidth.

Prior to be demodulated, they must be separated each other, which is done (in a FDM multiplexing scheme) using a series of band-pass filters.