Identify a true statement about qualitative research.

A$.$ It includes all of the factors that could influence the success of a strategy.

B$.$ It includes inventory data that can indicate how rapidly various products are selling and expenditure data on such things as advertising, personal selling, or packaging.

C$.$ It involves systematic procedures designed to obtain and analyze numerical data.

D$.$ It involves face$-$to$-$face interviews with respondents designed to develop a better understanding of what they think and feel concerning a research topic.