Which of the Following Is True About Conducting Interviews

Which of the following is true about conducting interviews?

A) Open-ended questions elicit a specific answer, such as yes or no.
B) Interviews are more effective when done spontaneously, especially if you'd like to quote your subjects in writing.
C) Interviews can have a variety of formats, including email exchanges to group discussions.
D) Closed questions should be included to solicit opinions, insights, and information.
E) Include many closed questions to take full advantage of the interactive interview setting.