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What is domain of function f(x)= x^1/2?

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What is domain of function f(x)= x^1/2?

(a) (2, ∞)

(b) (-∞, 1)

(c) [0, ∞)

(d) None of the mentioned

I had been asked this question during an interview.

Enquiry is from Domain and Range of Functions topic in chapter Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

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The correct answer is (c) [0, ∞)

Easiest explanation: A square root function is not defined for negative real numbers.

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