Let $X$ and $Y$ be subsets of $R$,the set of all real numbers. The function $f:X \to Y$ defined by $f(x) = x^2$ for $x \in X$ is one-one but not onto if (Here $R^+$ is the set of all positive real numbers):
- A$X = Y = R^+$
- B$X = R, Y = R^+$
- C$X = R^+, Y = R$
- D$X = Y = R$
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