In deformation of the body, the symmetry of ______ and symmetry of ____ can be used effectively.

(a) Stress and strain

(b) Nodes and displacement

(c) Geometry and strain

(d) Geometry and loading

This question was posed to me in class test.

The question is from Two Dimensional Problem Modelling and Boundary Conditions in chapter Two Dimensional Problems using Constant Strain Triangles of Finite Element Method