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Suppose that we have an $n$ by $m$ matrix. What must be true about the number of pivots? Select ALL correct answers below that apply.

The matrix has at least $n$ pivots.

The matrix has at most $n$ pivots.

The matrix has at least $m$ pivots.

The matrix has at most $m$ pivots.

The number of pivots is at most the minimum of $n$ and $m$.

The number of pivots is at least the minimum of $n$ and $m$.

There is at least one pivot.