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If the scattering matrix $[S]$ of a two port network is

\[ [S]=\left[\begin{array}{cc}

0.2 \angle 0^{\circ} & 0.9 \angle 90^{\circ} \\

0.9 \angle 90^{\circ} & 0.1 \angle 90^{\circ}

\end{array}\right] \]

then the network is

- lossless and reciprocal
- lossless but not reciprocal
- not lossless but reciprocal
- neither lossless nor reciprocal