Let $f, g: N -\{1\} \rightarrow N$ be functions defined by $f(a)=\alpha$, where $\alpha$ is the maximum of the powers of those primes $p$ such that $p^{\alpha}$ divides $a$, and $g(a)=a+1$, for all $a \in N -\{1\}$. Then, the function $f+ g$ is.

  • [JEE MAIN 2022]
  • A

    one-one but not onto

  • B

    onto but not one-one

  • C

    both one-one and onto

  • D

    neither one-one nor onto

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