Bredig's arc method is a method of preparation of colloidal solution, of metals such as gold, silver or platinum. Which of the following is involved in this method?

Question

$\begin{array}{1 1} (A) Condensation \\ (B) Dispersion \\ (C) \text{Dispersion followed by Condensation} \\ (D) \text{Condensation followed by Dispersion}\end{array}$