If the distances of two points $P$ and $Q$ on the parabola $y^2 = 4ax$ from its focus are $4$ and $9$ respectively,then what is the distance of the point of intersection of the tangents at $P$ and $Q$ from the focus?

  • A
    $8$
  • B
    $6$
  • C
    $5$
  • D
    $13$

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