Suppose that a > 0. Which of the following functions has all of these features?  one negative x-intercept  one positive y-intercept  one horizontal asymptote  one vertical asymptote A. f(x) = 1-7x/x2+a  B. f(x) = x+7/a-x  C. f(x) = a-x/x+7  D. f(x) = x+7/x2+a  E. f(x) = x2+a/x-7

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