A certain mass of calcium fluoride is added to water. The solution becomes cloudy, then clear as you see solid particles sink to the bottom of the container. Select all below that apply.

a) Calcium fluoride is insoluble in water.
b) Calcium fluoride is soluble in water.
c) The cloudy appearance is due to the formation of a precipitate.
d) The cloudy appearance is due to the formation of a colloid.