"Gravity filtration" is used in removing insoluble impurities from the desired compound during recrystallization. Which of the procedures below describe the correct way to remove the insoluble impurities?

A. Add ethanol and heat to dissolve the desired compound, then cool to room temperature before filtering to remove insoluble impurities

B. Add enough ethanol to dissolve the desired compound at room temperature and filter at room temperature to remove insoluble impurities

C. Add enough ethanol so that the compound of interest dissolves upon heating. Filter the hot mixture to remove insoluble impurities