Find the vertex and focus of the parabola.
A. vertex: (-7 , 0) focus: (0, 0)
B. vertex: (7, 0) focus: (0, 0)
C. vertex: (0, 0) focus: (-7, 0)
D. vertex: (0, 0) focus: (0, -7)
E. vertex: (0, 0) focus: (0, 7)
Answer: D
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?
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A. 
; (0, 1)
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; (1, 0)