Which of the following species can act as a Bronsted-Lowry acid as well as a Bronsted-Lowry base?

  • A
    $SO_4^{2-}$
  • B
    $HCO_3^{-}$
  • C
    $PO_4^{3-}$
  • D
    $H_2PO_2^{-}$

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