If $\frac{1}{p+q}, \frac{1}{r+p}$,and $\frac{1}{q+r}$ are in Arithmetic Progression $(AP)$,then which of the following is true?

  • A
    $p, q, r$ are in $AP$.
  • B
    $p^2, q^2, r^2$ are in $AP$.
  • C
    $\frac{1}{p}, \frac{1}{q}, \frac{1}{r}$ are in $AP$.
  • D
    None of these.

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