Place the steps of the water puri?cation process in order.
A) Aeration, ?ltration and settling, chemical disinfection, release into a water reservoir B) Chemical disinfection, aeration, ?ltration and settling, release into a water reservoir C) Filtration and settling, chemical disinfection, aeration, release into a water reservoir D) Release into a water reservoir, aeration, ?ltration and settling, chemical disinfection