$A$ line meets the coordinate axes at points $A$ and $B$. $A$ circle is circumscribed about the triangle $OAB$. If $m$ and $n$ are the distances of the tangents to the circle at points $A$ and $B$ respectively from the origin,then the diameter of the circle is

  • A
    $m(m + n)$
  • B
    $m + n$
  • C
    $n(m + n)$
  • D
    $\frac{1}{2}(m + n)$

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