What do "a" and "b" represent in the given structure of the nitrogenous base?

  • A
    a = $C=O$; b = $NH$
  • B
    a = $NH$; b = $C=O$
  • C
    a = $C=O$; b = $C=O$
  • D
    a = $NH$; b = $NH$

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