Which option is not correct about the four-noded rectangular plane stress element used in FEM?

Which option is not correct about the four-noded rectangular plane stress element used in FEM? Correct Answer Its Delaunay triangulation is unique

The four-node quadrilateral element with linear displacements for a plane stress problem has two degrees of freedom at each node. The total degrees of freedom of the element is eight. The displacement field is continuous across elements connected at nodes and the shape functions N1, N2, N3 and N4 are bilinear functions of x and y. Its Delaunay triangulationis not unique, but it has two solutions.

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