Which statement about competitive advantage is true?

A. With an effective overall cost leadership strategy, firms need not be concerned with product orservicefeatures

B. In the long run, a business witha strongcompetitive advantageis probably destined to earnlower than normal profits because it is usually quite costly to maintain such advantages.

C. If several competitors pursue similar differentiation tacticsthat are not materially different fromone another, they may all be perceived as equals in the mind of the consumer and the benefit ofsuch competitive advantagecan becomemuted or lost.

D. Developing multiple types of competitive advantage simultaneously, as a "best-cost" provider might, isthe mostpowerful combination strategy for sustainable competitive advantage.