A visitor-center model has a rectangular prism base 20 cm by 12 cm by 5 cm, a half-cylinder roof of radius 6 cm and length 20 cm, a cylindrical skylight of radius 2 cm and height 9 cm on top, and a cylindrical ventilation tube of radius 1 cm drilled through the full 20 cm length. Which setup correctly finds the volume? Use 3.14 for pi.