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Three reactions involving H2PO4- are given below:

(i) H3PO4 + H2H3O+H2PO4-

(ii) H2PO4- + H2HPO42- + H3O+

(iii) H2PO4- + OHH3PO4 +O2-

In which of the above does H2PO4-  act as an acid?

(a) (i) only                                 (b) (ii) only

(c) (i) and (ii)                             (d) (iii) only