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(C) The given equation of the parabola is $x^2 = -ay$.Comparing this with the standard form $x^2 = -4Ay$,we get $4A = a$,which implies $A = a/4$.The p

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$y = a/4$

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(C) The given equation of the parabola is $x^2 = -ay$.Comparing this with the standard form $x^2 = -4Ay$,we get $4A = a$,which implies $A = a/4$.The parabola $x^2 = -4Ay$ opens downwards with its vertex at $(0, 0)$ and focus at $(0, -A)$.The equation of the directrix for the parabola $x^2 = -4Ay$ is given by $y = A$.Substituting $A = a/4$,we get the equation of the directrix as $y = a/4$.

What is the equation of the directrix of the parabola $x^2 = -ay$?

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