Question

What is the second step in sketching the graph of a rational function?

A. Using test numbers to find where the function is positive and where it is negative
B. Finding the function's zeros and vertical asymptotes and plotting them on a number line
C. Sketching the function's graph and plotting additional points as guides when needed
D. Choosing test numbers to the left and right of each of the function's zeros and finding the value of the function at each test number