QUESTION 11 Among all the statements below about a 2D stress element, choose all which are true. + Tyz 01 Normal stress components exist as a pair of 2, in either x or y direction. Shear stress components exist as a pair of 4, i.e., those 4 components exist together or none at all. The 4 shear components on the element share same magnitude. The directions of the 4 shear components on the element are irrelevant from each other.