Which of the Following Defines Computer-Assisted Personal Interviewing

Which of the following defines computer-assisted personal interviewing?

A) Use of a specially designed phone room to conduct telephone interviews
B) A type of survey that usually involves interviewing business people at their offices concerning industrial products or services
C) An interviewing method in which a mall interviewer intercepts and directs willing respondents to nearby computers where each respondent reads questions off a computer screen and directly keys his or her answers into the computer
D) An interviewing method in which the interviewer reads questions from a computer screen and enters the respondent's data directly into the computer