If $f(x) = x + \frac{1}{x}$,$x \neq 0$,then the local maximum and minimum values of the function $f$ are respectively....

  • A
    $-1$ and $1$
  • B
    $-2$ and $2$
  • C
    $2$ and $-2$
  • D
    $1$ and $-1$

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