Find the distance between the parallel lines $l(x + y) + p = 0$ and $l(x + y) - r = 0$.

  • A
    $\frac{1}{\sqrt{2}} \frac{|p+r|}{l}$
  • B
    $\frac{1}{\sqrt{2}} \frac{|p-r|}{l}$
  • C
    $\frac{1}{\sqrt{2}} \frac{|p+r|}{l^2}$
  • D
    $\frac{1}{2} \frac{|p+r|}{l}$

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