If the bisectors of the pair of lines $x^2-2 m x y-y^2=0$ are represented by $x^2-2 n x y-y^2=0$,then

  • A
    $mn+1=0$
  • B
    $mn-1=0$
  • C
    $m+n=0$
  • D
    $m-n=0$

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