What is the result of adding the identity matrix III to itself?
(2002)\begin{pmatrix} 2 & 0 \\ 0 & 2 \end{pmatrix}(2002)
(1001)\begin{pmatrix} 1 & 0 \\ 0 & 1 \end{pmatrix}(1001)
(0000)\begin{pmatrix} 0 & 0 \\ 0 & 0 \end{pmatrix}(0000)
(4004)\begin{pmatrix} 4 & 0 \\ 0 & 4 \end{pmatrix}(4004)