The sequence of cytochromes in the electron transport system $(ETS)$ is:

  • A
    $cyt. b, c, a, a_3$
  • B
    $cyt. b, c, a_3, a$
  • C
    $cyt. a, b, c, a_3$
  • D
    $cyt. a, b, a_3, c$

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