A.
\(\begin{pmatrix}e^i\cos{\theta}&e^i\sin{\theta}\\-e^i\sin{\theta}&e^i\cos{\theta}\end{pmatrix}\)
B.
\(\begin{pmatrix}\cos{\theta}&\sin{\theta}\\-\sin{\theta}&\cos{\theta}\end{pmatrix}\)
C.
\(\begin{pmatrix}1&0\\0&1\end{pmatrix}\)
D.
\(\begin{pmatrix}e^i\cos{\theta}&e^i\sin{\theta}\\e^{-i}\sin{\theta}&e^i\cos{\theta}\end{pmatrix}\)