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.

  • 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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