Find the length of the latus rectum of the parabola whose focus is $(2, 3)$ and the directrix is the line $x - 4y + 3 = 0$.

  • A
    $\frac{7}{\sqrt{17}}$
  • B
    $\frac{14}{\sqrt{21}}$
  • C
    $\frac{7}{\sqrt{21}}$
  • D
    $\frac{14}{\sqrt{17}}$

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