1. $A=\left[\begin{array}{cc}1& i\\ -i& 1\end{array}\right] B=\left[\begin{array}{cc}i& -1\\ -1& -i\end{array}\right]$

• A. $\left[\begin{array}{cc}1& 0\\ 0& 0\end{array}\right]$
• B. $\left[\begin{array}{cc}1& 0\\ 0& 0\end{array}\right]$
• C. $\left[\begin{array}{cc}1& 0\\ 0& 0\end{array}\right]$
• D. $\left[\begin{array}{cc}1& 0\\ 0& 0\end{array}\right]$

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