Identify the correct statement (s) from the following a) Protective power of a lyophilic sol is more if its gold number is more b) In the coagulation of negative sols, the coagulating power of cations follow the order Na ⁺> Ba ²⁺> Al ³⁺ c) Cloud is a solid in gas type of colloid d) Physical adsorption is non-specific and multilayered at high pressure.