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The lengths of the tangents from two points \( A \) and \( B \) to a circle are \( l \) and \( l^{\prime} \) respectively. If the points are conjugate with respect to the circle, then \( (A B)^{2} \) is equal to
(a) \( l^{2}+l^{2} \)
(b) \( \left|l^{2}-l^{2}\right| \)
(c) \( \left(l+l^{\prime}\right)^{2} \)
(d) \( l l^{\prime} \)
E
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