The Geographical Sales Organization Structure Presents Which of the Following

The geographical sales organization structure presents which of the following disadvantages?

A) Each salesperson requires substantial product and customer knowledge.
B) This is the most costly form of sales organization.
C) Sales personnel may have a tendency to emphasize those products and end-use applications with which they are most familiar.
D) all of the answer choices.
E) Both each salesperson requires substantial product and customer knowledge and sales personnel may have a tendency to emphasize those products and end-use applications with which they are most familiar.