There are two circles whose equations are \( x^{2}+y^{2}=9 \) and \( x^{2}+y^{2}-8 x-6 y+n^{2}=0...

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There are two circles whose equations are \( x^{2}+y^{2}=9 \) and \( x^{2}+y^{2}-8 x-6 y+n^{2}=0, n \in Z \). If the two circles have exactly two common tangents then the number of possible values of \( n \) is
(a) 2
(b) 8
(c) 9
(d) none of these
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