Consider a 2 × 2 square matrix \[{\text{A}} = \left[ {\begin{array}{*{20}{c}} \sigma &{\text{x}} \\ \omega &\sigma \end{array}} \right]\]   where x is unknown. If the eigen values of the matrix A are \[\left( {\sigma + {\text{j}}\omega } \right)\]  and \[\left( {\sigma - {\text{j}}\omega } \right)\]  , then x is equal to

A. \[ + {\text{j}}\omega \]

B. \[ - {\text{j}}\omega \]

C. \[ + \omega \]

D. \[ - \omega \]

Answer: Option D