If \( 2 x+y+\lambda=0 \) is a normal to the parabola \( y^{2}=-8 x \), then the value of \( \lam...

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If \( 2 x+y+\lambda=0 \) is a normal to the parabola \( y^{2}=-8 x \), then the value of \( \lambda \) is
(a) \( -24 \)
(b) \( -16 \)
(c) \( -8 \)
(d) 24
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