Editor
The equation of the parabola, whose directrix is y=1, length of the latus rectum is 8 and opens downward is:
Difficulty: Easy
A: 
$x^{2}-2hx+8y+8+h^{2}=0$
B: 
$x^{2}-h^{2}+2hx-8y-8=0$
C: 
$x^{2}+8y+2hx+h^{2}-8=0$
D: 
None
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