Find the volume of the described solid of revolution or state that it does not exist. The region bounded by f(x) = x and the x-axis on the interval [1,) is revolved about the x-axis. Find the volume or state that it does not exist. Select the correct answer and, if necessary, fill in the box to complete your choice. A. The volume is cubic units. (Type an exact answer.) B. The volume does not exist.