Of the following acids
I. Hypophosphorous acid
II. Orthophosphorous acid
III Caro's acid
IV. Glycine
(a) I, II monobasic; III dibasic acid and IV amphoteric
(b) II monobasic; I, III dibasic acid and IV amphoteric
(c) I monobasic; II, II dibasic acid and IV amphoteric
(d) I, II, III dibasic acids and IV amphoteric