The open circuit input impedance of a 2-port network is

A. $$\frac{{\text{A}}}{{\text{C}}}\Omega $$
B. $$\frac{{\text{B}}}{{\text{D}}}\Omega $$
C. $$\frac{{\text{D}}}{{\text{C}}}\Omega $$
D. $$\frac{{\text{A}}}{{\text{B}}}\Omega $$
Answer: Option A

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