You're deciding on a speech topic, but need some information from your audience. Rather than asking them to divulge their opinions out loud, you design a short questionnaire

The questionnaire asks whether a person agrees or disagrees with a series of statements regarding various topics. What form of survey are you using?
a. an open-ended, formal audience analysis survey
b. a closed-ended, informal audience analysis survey
c. a closed-ended, formal audience analysis survey
d. an open-ended, informal audience analysis survey

c