The short-circuit admittance matrix of a two-port network is \[\left[ {\begin{array}{*{20}{c}}
0&{ - \frac{1}{2}} \\
{\frac{1}{2}}&0
\end{array}} \right]\]
The two-port network is
A. non-reciprocal and passive
B. non-reciprocal and active
C. reciprocal and passive
D. reciprocal and active
Answer: Option B

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