In the given scheme of ``Respiratory electron transport and oxidative phosphorylation'' identify A, B, C and D
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Trace the electron flow:
NADH $\rightarrow$ I $\rightarrow$ Q $\rightarrow$ III $\rightarrow$ Cyt c $\rightarrow$ IV $\rightarrow$ Oxygen.
Succinate $\rightarrow$ II $\rightarrow$ Q...