\( P\left(2 t^{2}, 4 t\right) \) is a point on the parabola \( y^{2}=8 x \) and \( Q(h, k) \) is....

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\( P\left(2 t^{2}, 4 t\right) \) is a point on the parabola \( y^{2}=8 x \) and \( Q(h, k) \) is a point on the tangent at \( P \) and external to the circle \( x^{2}+y^{2}=8 \).
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Answer the following questions.
If \( A B \) is the chord of contact of \( Q(h, k) \) with respect to the circle \( x^{2}+y^{2}=8 \), then the circumcentre of \( \triangle A Q B \) lies on the curve (when \( t=2 \) )
(1) \( x+2 y=4 \)
(2) \( x-2 y=4 \)
(3) \( 2 y=x+4 \)
(4) \( x+2 y+4=0 \)


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