If the length of the tangent drawn from any point on the circle \( ...

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If the length of the tangent drawn from any point on the circle \( x^{2}+y^{2}+15 x-17 y+c^{2}=0 \) to the circle \( x^{2}+y^{2}+15 x-17 y+21=0 \) is \( \sqrt{5} \) units, then \( c \) is equal to
(a) \( -3 \)
(b) 3
(c) \( -4 \)
(d) 4
\( \mathrm{E} \)
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