Redrunners Inc., a manufacturer of sports merchandise, is gathering customer opinions about the firm's new sports shoe line. A team of researchers in the company invited eight regular customers to talk about the new line of shoes, asking why they chose to buy the shoe and what they disliked most about its design. A moderator was present to monitor the discussion.
Which of the following types of contact methods is Redrunners using?

A) individual interviewing
B) mail questionnaire
C) group interviewing
D) mass survey
E) mall intercept