40. Which of the following descriptions about second messe ssengers is/are CORRECT? (A) Activation of G-protein coupled receptors results in the production of eyelic GMP (B) Diacyl glycerol and phosphatidylinositol 4,5-bisphosphate are catalytic products of inositol 1,4,5-triphosphate (C) AdenylyI cyclase produces cyclic AMP from ATP