Let $p, q$ and $r$ be the altitudes of a triangle with area $S$ and perimeter $2t$. Then,the value of $\frac{1}{p}+\frac{1}{q}+\frac{1}{r}$ is

  • A
    $\frac{S}{t}$
  • B
    $\frac{t}{S}$
  • C
    $\frac{S}{2t}$
  • D
    $\frac{2S}{t}$

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