QUESTION $18$ of $20$ : One thing that is usually true of focus groups is that

a$)$ Most groups take place over the course of several months

b$)$ they usually include $6$ to $12$ participants

c$)$ The group contains only research participants who guide themselves through the conversation

d$)$ The questions asked are primarily closed ended questions that are simple to tabulate

e$)$ The company's marketing team must be present in the focus group to explain key concepts and hear information first hand