Which of the Following Is True of Focus Groups Used

Which of the following is true of focus groups used by marketers to gather primary data?

A) They elicit information from the customers through a question-and-answer format.
B) They allow participants to respond at their leisure.
C) They are typically used for measuring the success of a new product introduced in a specific area.
D) They are valuable tool for exploratory research and development of new product ideas.