The radius of the cirlce whose centre is \( (-4,0) \) and \( \mathr...

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The radius of the cirlce whose centre is \( (-4,0) \) and
\( \mathrm{P} \) which cuts the parabola \( y^{2}=8 x \) at \( A \) and \( B \) such that

W the common chord \( A B \) subtends a right angle at the vertex of the parabola is equal to:
(1) \( 4 \sqrt{13} \)
(2) \( 3 \sqrt{5} \)
(3) \( 3 \sqrt{2} \)
(4) \( 2 \sqrt{5} \)
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