The perpendicular distance from the point $(1,2)$ to the common chord of the circles $x^2+y^2-2x+4y-4=0$ and $x^2+y^2+4x-6y-3=0$ is ........ units.

  • A
    $\frac{13}{\sqrt{123}}$
  • B
    $\frac{13}{\sqrt{136}}$
  • C
    $\frac{13}{\sqrt{63}}$
  • D
    $\frac{13}{\sqrt{132}}$

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