With Respect to Data Collection,what Is True

With respect to data collection,what is true?

A) Open-ended questions generally take more time to develop than closed-ended questions.
B) One form of observational data collection procedure is the use of a polygraph in the analysis of a respondent's answers during an interview.
C) A psychologist who plays in a sandbox with a group of preschoolers in order to gather data is engaged in in-group observations.
D) Data collection methods may divided into three basic and broad categories: surveys, interviews, and observations.