The abscissaes of two points \( A \) and \( B \) are roots of the equation \( x^{2}+2 a x-b^{2}=....

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The abscissaes of two points \( A \) and \( B \) are roots of the equation \( x^{2}+2 a x-b^{2}=0 \) and their ordinates are the
\( \mathrm{P} \)
roots of the equation \( x^{2}+2 p x-q^{2}=0 \). The radius of
W
the circle with \( A B \) as diameter is
(1) \( \sqrt{\left(a^{2}+b^{2}+p^{2}+q^{2}\right)} \)
(2) \( \sqrt{\left(a^{2}+p^{2}\right)} \)
(3) \( \sqrt{\left(b^{2}+q^{2}\right)} \)
(4) None of these
.


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