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If Z is a function of Y, and Y is a function of X then Z is a function of X. Which among the following options is the concept that supports the given statement?

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If Z is a function of Y, and Y is a function of X then Z is a function of X. Which among the following options is the concept that supports the given statement?

(a) Composition

(b) Recursion

(c) Primitive recursion

(d) Aggregation

I had been asked this question during an online exam.

My question is taken from Computational Processing Resources in portion Software Defined Radio Architecture of Cognitive Radio

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Right answer is (a) Composition

For explanation: Composition is the point wise application of one function to the result of another to produce a third function. A set is closed under composition of functions.

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