Which of the Following Statements About the Follow-Up a Salesperson

Which of the following statements about the follow-up a salesperson performs after a sale is true?

A) The nature of the follow-up should reflect the needs of the buying center member being contacted.
B) Personal follow-up visits should be avoided because they are expensive and tend to accomplish little.
C) Salespeople should follow-up with only those members of the buying center who are directly involved in the use of the product.
D) Salespeople should ideally follow the 3-by-3 strategy to make all their follow-up calls.
E) Telephone calls are seen as intrusive and must be avoided as a follow-up communication channel.