Explanation : Research design is a broad and comprehensive
action plan or strategy formulated by
researcher for obtaining the answers of
research question. The research design
explains the type of research (experimental,
survey, correlational, semi-experimental,
review) and also its sub-type (experimental
design, research problem, descriptive
case-study). The main sections of research
design are: sample selection, formulation of
research plan, tool selection, data collection
and data analysis.
So, A, B, C are its features.