Let $f: R \rightarrow R$ be defined by $f(x) = x^{2} - \frac{x^{2}}{1+x^{2}}$ for all $x \in R$. Then,

  • A
    $f$ is one-one but not onto mapping
  • B
    $f$ is onto but not one-one mapping
  • C
    $f$ is both one-one and onto
  • D
    $f$ is neither one-one nor onto

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