Which of the following is both a decomposition reaction and a reduction-oxidation reaction? a. H2CO3(aq) --> Co2(g) + H2O(l) b. Zn(s) + SuNO3(aq) --> Cu(s) + ZnNO3 (aq) c. Ca(OH)2(aq) + 2HCl(aq) --> CaCl2(aq) + 2H2O(l) d. 2NH4NO3(s) --> 2N2(g) + O2(g) + 4H2O(g) e. CaCO3(s) --> CaO (s) + CO2(g)