Among the reactions (a) - (d), the reaction(s) that does/do not occur in the blast furnace during the extraction of iron is/are
(a) $\mathrm{CaO}+\mathrm{SiO}_2 \rightarrow \mathrm{CaSiO}_3$
(b) $3 \mathrm{Fe}_2 \mathrm{O}_3+\mathrm{CO} \rightarrow 2 \mathrm{Fe}_3 \mathrm{O}_4+\mathrm{CO}_2$
(c) $\mathrm{FeO}+\mathrm{SiO}_2 \rightarrow \mathrm{FeSiO}_3$
(4) $\mathrm{FeO} \rightarrow \mathrm{Fe}+\frac{1}{2} \mathrm{O}_2$