How many numbers of P-0H and P-0-P bonds are present in pyrophosphoric acid respectively?

How many numbers of P-0H and P-0-P bonds are present in pyrophosphoric acid respectively?
  1. 3,1
  2. 4,1
  3. 4,3
  4. 3,3

Asked in: MHT CET 2020 (16 Oct Shift 2)

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