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

• A. + jω
• B. − jω
• C. +ω
• D. –ω