A Start-Up Has Developed a Business-To-Business Product That Allows for Integration

A start-up has developed a business-to-business product that allows for integration of inventory,billing,shipping,teleconferencing,and webinar functions.This allows salespeople to demonstrate,check inventory,close a sale,and ship the product during a presentation with the client in person or by webinar.
-To train the sales reps,the company should:

A) ask the sales reps to read three classic sales texts and engage in a role-playing workshop
B) hire a trainer who understands sales techniques to train the sales reps in groups of three
C) send the sales reps to a standardized course that teaches sales theory
D) develop an in-house training course focused on product knowledge supplemented by a refresher in sales techniques delivered by a hired company
E) send the sales reps to shadow the product developers to learn how they develop products for the company