Rather Than Adopting the Approach of "One Design Fits All

Rather than adopting the approach of "one design fits all," the astute marketer matches the strategy to the product and market conditions that surround a particular relationship. Which of the following statements is(are) true?

A) It is unwise for marketers to make specialized investments in transactional relationships.
B) For transactional customers,the salesperson should center primary attention on the purchasing staff.
C) Transactional customers display less loyalty to a particular supplier and can easily switch part or all of their purchases from one vendor to another.
D) all of the above
E) (a) and (c) only