Follow the steps for graphing a rational function to graph the function Upper R left parenthesis x right parenthesis equals StartFraction x squared plus 13 x plus 40 Over x plus 8 EndFraction Determine the vertical asymptote(s), if one exists. Select the correct choice below and, if necessary, fill in the answer box(es) to complete your choice. A. The function has one vertical asymptote, enter your response here. (Type an equation. Use integers or fractions for any numbers in the equation.) B. The function has two vertical asymptotes. The leftmost asymptote is enter your response here, and the rightmost asymptote is enter your response here. (Type equations. Use integers or fractions for any numbers in the equations.) C. The function has three vertical asymptotes. The leftmost asymptote is enter your response here, the middle asymptote is enter your response here, and the rightmost asymptote is enter your response here. (Type equations. Use integers or fractions for any numbers in the equations.) D. The function has no vertical asymptote