True statements about silicones/ silicates are: I) Silicones resist oxidation and attack by organic reagents II) Silicones are lubricants at low as well as high temperature III) Cross-linked silicones are formed by the hydrolysis of trichlorosilicone and subsequent polymerization IV) Silicones are good electrical insulators and are antifoaming agents. V) Both Silicones and Silicates compound contains Si – O – Si linkage