A two port network N has transmission parameters \(\left[ {\begin{array}{*{20}{c}} A&B\\ C&D \end{array}} \right]\). The open circuit input impedance of the network at port 1, will be
1
D/C
2
A/C
3
AB/DC
4
AD/BC
A two port network N has transmission parameters \(\left[ {\begin{array}{*{20}{c}} A&B\\ C&D \end{array}} \right]\). The open circuit input impedance of the network at port 1, will be