If A=(4004)A = \begin{pmatrix} 4 & 0 \\ 0 & 4 \end{pmatrix}A=(4004), what is the scalar product kAk AkA when k=14k = \frac{1}{4}k=41?
(1001)\begin{pmatrix} 1 & 0 \\ 0 & 1 \end{pmatrix}(1001)
(4004)\begin{pmatrix} 4 & 0 \\ 0 & 4 \end{pmatrix}(4004)
(160016)\begin{pmatrix} 16 & 0 \\ 0 & 16 \end{pmatrix}(160016)
(0110)\begin{pmatrix} 0 & 1 \\ 1 & 0 \end{pmatrix}(0110)