Question: Frequency division multiplexing is accomplished by 1) modulating two or more carrier signals transmitted simultaneously on the same medium. 2) switching rapidly among frequencies, or

Frequency division multiplexing is accomplished by

1) modulating two or more carrier signals transmitted simultaneously on the same medium.

2) switching rapidly among frequencies, or frequency-hopping.

3) sending two or more digital signals alternately on the same medium.

4) sending explicit timing information along with the digital signal

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