In the world of market research the use of a questionnaireoften plays a vital ro

In the world of market research the use of a questionnaireoften plays a vital role in gaining useful business intelligencebecause:A. it is a structured technique to collect secondarydataB. it represents a way to ask anything you want fromrespondents and receive valid informationC. it does not need to be testedD. it can be used in conjunction with other techniques suchas field interviews and focus groups to maximize data input