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Which of the following statements are true in regards to the form of the square of an even integer? Select ALL that apply.

The square of any even integer has the form $8n$ for some integer $n$.

The square of any even integer has the form $4m$ for some integer $m$.

The square of any even integer has the form $16k$ for some integer $k$.

The square of any even integer has the form $2j$ for some integer $j$.