Which of the Following Is True About Cross-Functional Sales Teams

Which of the following is true about cross-functional sales teams?

A) They are used in certain industries to focus solely on promotion of existing products and introduction of new products.
B) They are used when a product is very expensive and is being sold to the whole organization.
C) They provide training to the front-line staff of the buying organization.
D) They are especially useful when a product is to be used to solve certain technical problems of the buyer.