The line \( L_{1} \equiv 4 x+3 y-12=0 \) intersects the \( x \) - and \( y \)-axis at \( A \) an...

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The line \( L_{1} \equiv 4 x+3 y-12=0 \) intersects the \( x \) - and \( y \)-axis at \( A \) and \( B \), respectively. A variable line perpendicular to \( L_{1} \) intersects the \( x \) - and the \( y \)-axis at \( P \) and \( Q \), respectively. Then the locus of the circumcenter of triangle \( A B Q \) is
(A) \( 3 x-4 y+2=0 \)
(B) \( 6 x-8 y+7=0 \)
(C) \( 4 x+3 y+7=0 \)
(D) none of these
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