Which of the following is classified as a multimolecular colloid?

The correct statement$(s)$ related to colloids is(are):
$(A)$ The process of precipitating colloidal sol by an electrolyte is called peptization.
$(B)$ Colloidal solution freezes at a higher temperature than the true solution at the same concentration.
$(C)$ Surfactants form micelles above the critical micelle concentration $(CMC)$. $CMC$ depends on temperature.
$(D)$ Micelles are macromolecular colloids.

Sodium stearate forms in water:

Why do we add alum to purify water?

Fog is a colloidal solution of

Jelly is a colloidal solution of