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The length of the tangent drawn from any point on the circle \( x^{2}+y^{2}+2 g x+2 f y+p=0 \) to the circle
\( \mathrm{P} \) \( x^{2}+y^{2}+2 g x+2 f y+q=0 \) is:

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(A) \( \sqrt{q-p} \)
(B) \( \sqrt{p-q} \)
(C) \( \sqrt{q+p} \)
(D) \( \sqrt{2 q+p} \)
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