David leads his firm's marketing team. He is responsible for forecasting the business's sales. David's team prepared a questionnaire based on the market data that it has collected. David decided to send coples of these questionnaires to his company's Junior-level and senlor-level employees across varlous business functions, as well as to some renowned Industry experts. David plans to forecast his company's sales based on the opinions that he sees in this survey. Which method of sales forecasting does David plan to use?
A. moving averages method
B. jury of executive opinion method
C. buyer intentions method
D. Delphi method