A state of pure shear m a biaxial stress is gives by:

• A. \[\left[ \begin{matrix}    {{\sigma }_{1}} & {{\sigma }_{1}}  \\    0 & {{\sigma }_{2}}  \\ \end{matrix} \right]\]
• B. \[\left[ \begin{matrix}    {{\sigma }_{1}} & 0  \\    0 & -{{\sigma }_{2}}  \\ \end{matrix} \right]\]
• C. \[\left[ \begin{matrix}    {{\sigma }_{x}} & {{\tau }_{xy}}  \\    0 & -{{\sigma }_{Y}}  \\ \end{matrix} \right]\]
• D. none of the above