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The domain of function r is (-?, -7) U (-7, 5) U (5, ?), and the value of the function approaches 1 as x approaches

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The domain of function r is (-?, -7) U (-7, 5) U (5, ?), and the value of the function approaches 1 as x approaches -? and ?. Which function could be function r?A. f(x) = x-5/x+7B. f(x) = 2x-35/x^2+2x-35C. f(x) = x^2-3x-15/x^2+2x-35D. f(x) = x^2+2x-35/x^2-3x-15

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