Which of the Following Is NOT Descriptive of the Matrix

Which of the following is NOT descriptive of the matrix structure?

A) People from functional units are often assigned on a temporary basis to product units.
B) Although employees often work on one or more product units, they maintain only one direct supervisor.
C) The matrix structure is very useful when the external environment is very uncertain.
D) The matrix structure can produce conflicts revolving around duties, authority, and resource allocation.
E) The matrix structure was developed to combine the stability of functional structure with the flexibility of the product form.