Determine the vertex, focus, and directrix of the parabola and sketch its graph.x2 = 16y
A. vertex: (0, 0)
focus: 
directrix: y = - 
B. vertex: (0, 0)
focus: 
directrix: y = 
C. vertex: (0, 0)
focus: 
directrix: y = - 4
D. vertex: (0, 0)
focus: 
directrix: x = 4
Answer: C
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