Which of the Following Is an Advantage Typically Associated with Face-To-Face

Which of the following is an advantage typically associated with face-to-face interviews?

A) They allow researchers to build a rapport with each participant to draw out authentic answers.
B) They are very cost effective as the researcher himself can conduct the survey.
C) They are much less time consuming compared to other research methods.
D) They allow researchers to indirectly observe the subjects without their knowledge.
E) They ensure that the identity of the subject is not revealed to the researcher.