Find the volume of the described solid of revolution or state that it does not exist. , x + 18 The region bounded by f(x) = and the xaxis on the interval [2,00) is revolved about the x-axis. Find the volume or state that it does not exist. Select the correct answer and, if necessary, ll in the box to complete your choice. [a A. The volume is cubic units. (Type an exact answer.) _ B. The volume does not exist