Identify the vertex focus and directrix of the graph x^2-8x-28y-124=0 a. vertex (4,5) focus (4,2) directrix y=2. b. vertex (-4,5) focus (0,7) directrix y=7 c. vertex (4,-5) focus (4,2) directrix y=-12 d. vertex (-4,5) focus (4,-12) directrix y=2
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