The suppliers to an industry teThe reason operation efficiency is necessary but not sufficient is because: A. Rivals can always be more efficient B. Rivals can eventually bench mark and copy management practices C. Rivals can lower their prices and win a price war D. Rivals can outsource non valued added activities nd to have more leverage and bargaining power when: A. the supplier group is composed of many, relatively small firms B. the buying firms are very important customers of the suppliers C. the products of the suppliers are more or less identical D. one or more suppliers pose a credible threat to integrate forward into the business of the buyer