A Ribbed Reinforced Concrete Slab- On- Ground Foundation Is Preferred

Multiple Choice

A ribbed reinforced concrete slab- on- ground foundation is preferred over a constant- thickness slab foundation because

A) it does not require control joints.
B) its formwork is simpler.
C) it can be constructed more quickly.
D) it provides the same strength and stiffness at a lower cost.
E) all of the above.