If $a=|\bar{a}|$ and $b=|\bar{b}|$,then $\left(\frac{\bar{a}}{a^2}-\frac{\bar{b}}{b^2}\right)^2=$

  • A
    $\left(\frac{\bar{a}-\bar{b}}{a^2 b^2}\right)^2$
  • B
    $\left(\frac{\bar{a}-\bar{b}}{a b}\right)^2$
  • C
    $\left(\frac{b \bar{a}-a \bar{b}}{a b}\right)^2$
  • D
    $\left(\frac{a \bar{a}-b \bar{b}}{a^2 b^2}\right)^2$

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