What term describes a wide-bandwidth system in which the RF carrier varies according to a predetermined sequence?

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Spread-spectrum communication describes a method where the signal occupies more bandwidth than the minimum and the RF carrier is changed according to a predetermined sequence. This sequence governs how the carrier hops from one frequency to another, which is the hallmark of frequency-hopping spread spectrum (a common form of spread-spectrum). The result is a wide-band signal that is more resistant to interference and eavesdropping. The other options describe specific modulation schemes or techniques that don’t inherently define a wide-band carrier hopping pattern, so they don’t fit the description as well.