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Consider a function: f(n) = number of elements in the set {a: 0 <= a < n and gcd(a,n) = 1}. What is this function?

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Consider a function: f(n) = number of elements in the set {a: 0 <= a < n and gcd(a,n) = 1}. What is this function?

(a) Primitive

(b) Totient

(c) Primality

(d) All of the mentioned

This question was addressed to me in exam.

The doubt is from Number Theory topic in section More Number Theory of Cryptograph & Network Security

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The correct option is (b) Totient

To elaborate: Such a set is known as Totient.

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