The length of the latus rectum of a parabola,whose vertex and focus are on the positive $x$-axis at a distance $R$ and $S$ $(S > R)$ respectively from the origin,is:

  • A
    $4(S+R)$
  • B
    $2(S-R)$
  • C
    $4(S-R)$
  • D
    $2(S+R)$

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