Which of the following statements is true about AgI sol prepared by peptization of AgI with KI.

• A

  In electrophoresis, the dispersed phase will move towards cathode.

• B

  NaCl is more effective than A1₂(SO₄)₃ for bringing about coagulation of sol.

• C

  On addition of NaCl in sol, the solution is stabilised

• D

  On persistent dialysis of sol, precipitation of colloidal sol take place (coagulation).