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If the number of subsets of a set are 4 then the number of elements in that sets are _________

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If the number of subsets of a set are 4 then the number of elements in that sets are _________

(a) 1

(b) 2

(c) 3

(d) 4

The question was asked in an interview.

This interesting question is from Subsets topic in chapter Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

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Best answer
The correct choice is (b) 2

To elaborate: The number of elements be x then x^2 = 4 thus x=2.

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