Determine the vertical asymptote s of the function If none exists state that fact x 2 x3 8x 12x f x Select the correct choice below and if necessary fill in the answer box es to complete your choice OA The function has three vertical asymptotes The leftmost asymptote is Type equations OB The function has one vertical asymptote Type an equation OC The function has two vertical asymptotes The leftmost asymptote is Type equations OD The function has no vertical asymptotes the middle asymptote is and the rightmost asymptote is and the rightmost asymptote is