A$8.$ For the stress state $($in MPa$)$ shown, calculate the principal stresses and principal stress angles.

A$.$ Maximum principal stress of $51\mathrm{.}4$ MPa at $82\mathrm{.}03$ clockwise.

B$.$ Maximum principal stress of $51\mathrm{.}4$ MPa at $15\mathrm{.}95$ clockwise.

C$.$ Minimum principal stress of $-21\mathrm{.}4$ MPa at $15\mathrm{.}95$ counterclockwise.

D$.$ Minimum principal stress of $-21\mathrm{.}4$ MPa at $82\mathrm{.}03$ counterclockwise.