Write the steps in the complete ionization of the following polypeptide acids.

Ionization of H2CO3 
Step-1: 
H2CO3 (aq) + H2O (l) <> HCO3- (aq) + H3O+ (aq) 
Step-2: 
HCO3- (aq) + H2O (l) <> CO32- (aq) + H3O+ (aq) 
Ionization of H3BO3 
Step 1 is 
H3BO3(aq) + H2O(l) <=> H2BO3-(aq) + H3O+(aq) 
Step-2: 
H2BO3-(aq) + H2O(l) <=> HBO3^-2(aq) + H3O+(aq) 
Step 3 is
HBO3^-2(aq) + H2O(l) <=> BO3^-3(aq) + H3O+(aq)  
credits go to Mary Nancy  :)

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The answer to the question is d