Which of the following represents a saponification reaction?
(a) \(CH_3OONa+NaOH\overset{CaO}\rightarrow CH_4+Na_2CO_3\)
(b) \(CH_3COOH+C_2H_5OH\overset{H_2SO_4}\rightarrow 2CH_3COONa + H_2\)
(c) 2CH3COOH + 2Na → 2CH3COONa + H2
(d) CH3COOC2H5 + NaOH → CH3COONa + C2H5OH