Which equations are balanced? Select all that apply.
a. C6H1206 +602 --> 6H2O +6CO2

b.302 + 2A1 --> 2A103

C.2C6H12O6 +302 --> H2O +6CO2

d. H2CO3 --> 2H2O + CO2

e. H2CO3 --> H2O + CO2

f. 302 + Al--> 3AIO3