itional Functions Find the equation(s) of the vertical asymptote(s) of the given rational function. x + 9x x-4x-12 f(x)= Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. The function has two vertical asymptotes. The leftmost asymptote is and the rightmost asymptote is (Simplify your answers. Type equations.) B. There is no vertical asymptote. C. The function has one vertical asymptote, (Simplify your answer. Type an equation.) O