— which of the following best describes a research design?

A. it serves as a framework for the literature review and answering the research questions.

B. it is the overall strategy that you choose to integrate while planning the research proposal

C. it makes the conclusion valid because it takes into consideration all the assumptions that went into deriving the various inferences

D. it ensures that appropriate data will be obtained that permits an objective analysis leading to valid inferences about the stated problem ​