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The locus of a point which moves such that the tangents from it to the two circles \( x^{2}+y^{2}-5 x-3=0 \) and \( 3 x^{2}+3 y^{2}+2 x+4 y-6=0 \) are equal, is
(a) \( 2 x^{2}+2 y^{2}+7 x+4 y-3=0 \)
(b) \( 17 x+4 y+3=0 \)
(c) \( 4 x^{2}+4 y^{2}-3 x+4 y-9=0 \)
(d) \( 13 x-4 y+15=0 \).
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