Which of these method returns a smallest whole number greater than or equal to variable X?

(a) double Ciel(double X)

(b) double Floor(double X)

(c) double Max(double X)

(d) double Min(double X)

I had been asked this question in class test.

The query is from Rounding Functions in portion Reflections, Multithreaded Programming, Collection Classes and Mathematical Functions of C#

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