5. To protect the freshwater system during the cold winter months, you should:
A. flush boiling water through it twice a day.
B. add a cup of nontoxic antifreeze for each gallon of water in the tank.
C. drain the system, add nontoxic antifreeze, and then run the system until antifreeze comes out the faucets.
D. drain the system, then blow it out with compressed air.
E. C. or D