If \( \left(x_{r}, y_{r}\right) ; r=1,2,3,4 \) be the points of intersection of the parabola \( ...

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If \( \left(x_{r}, y_{r}\right) ; r=1,2,3,4 \) be the points of intersection of the parabola \( y^{2}=4 a x \) and the circle \( x^{2}+y^{2}+2 g x+2 f y+c=0 \), then
(a) \( y_{1}+y_{2}+y_{3}+y_{4}=0 \)
(b) \( y_{1}+y_{2}-y_{3}-y_{4}=0 \)
(c) \( y_{1}-y_{2}+y_{3}-y_{4}=0 \)
(d) \( y_{1}-y_{2}-y_{3}+y_{4}=0 \)
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