For the parabola $y^2 = 4ax$ with $a > 0$, the directrix is the line:
A$x = -a$
B$x = a$
C$y = a$
D$y = -a$
Answer & Solution
Correct answer: A. $x = -a$
Standard parabola $y^2 = 4ax$: focus $(a, 0)$, directrix $x = -a$.
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