The matrix $\left[\begin{array}{lll}2 & 0 & 0 \\ 0 & 1 & 0 \\ 0 & 0 & 1\end{array}\right]$ is a
Answer & explanation
Correct answer: option 4
$\left[\begin{array}{lll}2 & 0 & 0 \\ 0 & 1 & 0 \\ 0 & 0 & 1\end{array}\right]$
as only diagonal elements are filled all other are zero
this is a diagonal matrix