Which statement about sales training is true? sales training is usually needed only for new salespeople, Sales training usually isn't necessary if a new salesperson has had similar selling experience calling on the same customers for a competing company, Sales training programs should focus on product and company information only, since research shows that training is not effective in developing selling skills, Sales training should include on$-$the$-$job observation, but classroom and web$-$based learning is rarely needed, or Sales training should be modified