Matlab question

Assuming we have a function that has one input, a square $(nn,$ for any integer $n)$ matrix $M.$ It returns three outputs: $D,A,$ and $B,$ where each of them is a square matrix of $nn.$

D: takes only diagonal elements in M$,$ other elements are zeros

A: takes only all elements above diagonal in $M,$ other elements are zeros

B: takes only all elements below diagonal in M$,$ other elements are zeros

Assuming M $=[1234$; $5678$; $9101112$; $13141516],$ which of the following is true?