Determine the vertical asymptote(s) of the following function. If none exists, state that fact. 9 f(x) = x2 +81 Select the correct choice below and, if necessary, fill in the answer box(es) to complete your choice O A. The function has one vertical asymptote (Type an equation.) O B. The function has two vertical asymptotes The leftmost asymptote is and the rightmost asymptote is (Type equations ) O C. The function has three vertical asymptotes. The leftmost asymptote is the middle asymptote is , and the rightmost asymptote is (Type equations.) O D. The function has no vertical asymptotes