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Which among the following techniques use direct sequence spread spectrum?

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Which among the following techniques use direct sequence spread spectrum?

(a) Code Division Multiple Access

(b) Frequency Division Multiple Access

(c) Time Division Multiple Access

(d) Orthogonal Frequency Division Multiple Access

I had been asked this question in a national level competition.

My question is from Radio Flexibility in portion Cognitive Radio Basics of Cognitive Radio

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Correct answer is (a) Code Division Multiple Access

The explanation: Code Division Multiple Access is a channel access method. It allows a user to occupy the allocated bandwidth for an entire period. This is accomplished by spread spectrum technology where each user is provided with a spreading code for transmission.

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