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Let the equation of a circle be \( x^{2}+y^{2}=a^{2} \). If \( h^{2}+k^{2}-a^{2}0 \) then the line \( h x+k y=a^{2} \) is the
\( \mathrm{P} \)
(a) polar line of the point \( (h, k) \) with respect to the circle
W.
(b) real chord of contact of the tangents from \( (h, k) \) to the circle
(c) equation of a tangent to the circle from the point (h, k)
(d) none of these
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