Find the limits in a) through c ) below for the function f(x)=x7x2x42. Use and when appropriate. a) Select the correct choice below and fill in any answer boxes in your choice. A. limf(x)= (Simplify your answer.) x7 B. The limit does not exist and is neither nor . b) Select the correct choice below and fill in any answer boxes in your choice. A. limf(x)= (Simplify your answer.) x7+ B. The limit does not exist and is nelther nor . c) Select the correct choice below and fill in any answer boxes in your choice. A. limx7f(x)= (Simplify your answer.) B. The limit does not exist and is neither nor