Which of the following degree sequence diagrams are invalid for a connected…

Which of the following degree sequence diagrams are invalid for a connected graph with 6 vertices?

  1. A.

    5,5,3,2,2,1

  2. B.

    6,5,4,3,2,1

  3. C.

    2,2,2,2,1,1

  4. D.

    5,4,3,2,2,1

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