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Which assumption is not valid in the analysis of gravity dams

[A].	The material in the foundation and in the body of the dam is isotropic and homogeneous	[B].	The foundation and the dam behave as one unit, the joint being a perfect one
[C].	No loads are transferred to abutments by beam action	[D].	The stress in the foundation and the body of the dam are within plastic limits
[E].	No movements are caused in the foundations due to transference of the load

Answer: Option D