If the line \( h x+k y=1 \) touches \( x^{2}+y^{2}=a^{2} \), then the locus of the point \( (h, ...

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If the line \( h x+k y=1 \) touches \( x^{2}+y^{2}=a^{2} \), then the locus of the point \( (h, k) \) is a circle of radius
(A) \( a \)
(B) \( \frac{1}{a} \)
(C) \( \sqrt{a} \)
(D) \( \frac{1}{\sqrt{a}} \)
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