For a finite element mesh to be valid, which option is not true regar

1.	For a finite element mesh to be valid, which option is not true regarding the elements used?
A.	The number of elements used is not exact
B.	Elements can be of different orders
C.	Elements can be of different types
D.	The choice of elements and mesh is problem-independent
Answer» E.

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For a finite element mesh to be valid, which option is not true regarding the elements used?

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