\begin{tabular}{|c|}
\hline \begin{tabular}{l}
The state of stress at the critical location in a structure is $\sigma_{x x}=420 \mathrm{MPa}$, \\
$\sigma_{y y}=100 \mathrm{MPa}, \sigma_{z z}=\sigma_{x y}=\sigma_{y z}=\sigma_{z x}=0$. The yield stress of the material in \\
uniaxial tension is $400 \mathrm{MPa}$. Select the correct statement among the following.
\end{tabular} \\
\hline \begin{tabular}{l}
The structure is safe by both Tresca (maximum shear stress) theory and von-Mises \\
(distortion energy) theory.
\end{tabular} \\
\hline \begin{tabular}{l}
The structure is safe by Tresca (maximum shear stress) theory and unsafe by \\
von-Mises (distortion energy) theory.
\end{tabular} \\
\hline \begin{tabular}{l}
The structure is unsafe by Tresca (maximum shear stress) theory and safe by \\
von-Mises (distortion energy) theory.
\end{tabular} \\
\hline \begin{tabular}{l}
The structure is unsafe by both Tresca (maximum shear stress) theory and \\
von-Mises (distortion energy) theory.
\end{tabular} \\
\hline
\end{tabular}
