1. Which is the identity matrix?
A.
\left(\begin{matrix}
1 & 3 & 2 \\
1 & 3 & 2 \\
6 & 1 & 3
\end{matrix}\right)
B.
\left(\begin{matrix}
0 & 0 & 0 \\
0 & 0 & 0 \\
0 & 0 & 0
\end{matrix}\right)
C.
\left(\begin{matrix}
1 & 1 & 1 \\
0 & 1 & 1 \\
0 & 0 & 1
\end{matrix}\right)
D.
\left(\begin{matrix}
1 & 0 & 0 \\
0 & 1 & 0 \\
0 & 0 & 1
\end{matrix}\right)
E.
\left(\begin{matrix}
1 & 1 & 1 \\
1 & 1 & 1 \\
1 & 1 & 1
\end{matrix}\right)
Solution:
Identify matrix has all ones on its diagonal
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