$27.$ Which of the following is the most valuable piece of information the sales force can bring into forecasting situations?

a$)$what customers are most likely to do in the future

b$)$what customers most want to do in the future

c$)$what plans customers are considering for the future

d$)$whether customers are satisfied or dissatisfied with their performance in the past

e$)$what the salesperson's appropriate sales quota should be