Which Arrays Are Heaps

Zero-indexed arrays, so the children of index $i$ are $2i+1$ and $2i+2$ . Which of these satisfy the min-heap property? More than one applies.

[1, 2, 3, 4, 5, 6, 7]

[1, 5, 2, 6, 7, 0]

[1, 3, 2, 7, 4, 5, 6]

[2, 4, 3, 5, 1]

[3, 3, 3, 4]