Consider a two-port network with the transmission matrix: \({\rm{T}} = \left( {\begin{array}{*{20}{c}} {\rm{A}}&{\rm{B}}\\ {\rm{C}}&{\rm{D}} \end{array}} \right).\) If the network is reciprocal, then

• A. \({{\rm{T}}^{ - 1}}{\rm{\;}} = {\rm{\;T}}\)
• B. \({{\rm{T}}^2}{\rm{\;}} = {\rm{\;T}}\)
• C. Determinant (T) = 0
• D. Determinant (T) = 1