What are the coordinates of the focus and the equation of the directrix?
A. focus:; [-1/4, 0]; directrix: x = 1/4
B. focus:; [1/4, 0]; directrix: x = - 1/4
C. focus: (-4,0); directrix: x = 4
D. focus: (4,0); directrix: x = - 4
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