A "best practice" refers to a

A$.$

method of performing an activity or business process that consistently delivers superior results compared to other approaches and that at least one company has demonstrated works particularly well in terms of delivering operating excellence.

B$.$

strategy$-$critical activity that results in sustainable competitive advantage.

C$.$

particular value chain activity that management has given top priority to performing in world$-$class fashion.

D$.$

value chain activity that is a company's distinctive competence.

E$.$

policy or procedure that is unusually effective.