Which of the following sequences of array elements forms a heap?

GATE · 2006 · IT

1. A.

   {23, 17, 14, 6, 13, 10, 1, 12, 7, 5}

2. B.

   {23, 17, 14, 6, 13, 10, 1, 5, 7, 12}

3. C.

   {23, 17, 14, 7, 13, 10, 1, 5, 6, 12}

4. D.

   {23, 17, 14, 7, 13, 10, 1, 12, 5, 7}

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