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Find all vertical asymptotes, x = a, of the following function. For each value of a, evaluate lim f(x), lim f(x), and lim f(x). Use co or - co when appropriate. x-a x-a x2 - 8x + 15 f(x) = x2 - 5x +6 Select the correct choice below, and fill in the answer box if necessary. O A. The vertical asymptote is x = . The limits at this vertical asymptote are lim f(x) = , lim f(x) = ,and X-a x->a lim f(x) = X-a B. The vertical asymptote is x = The limits at this vertical asymptote are lim f(x) = , lim f(x) = , and x->a x-a lim f(x) does not exist and is neither co nor - co. X-a O C. There is no vertical asymptote