Which of the Following Statements Is True of the Sources

Which of the following statements is true of the sources of competitive advantage?

A) The best companies choose one source of competitive advantage and perfect it.
B) Managing the sources of competitive advantage is a zero-sum game where one source suffers at the expense of the other.
C) It is possible to improve quality and also enhance speed.
D) Trade-offs do not occur among the six sources of competitive advantage.
E) Sustainability is the speed and dependability with which an organization delivers what customers want.