Which of the following is the main purpose of the pre-data collection literature review for

Which of the following is the main purpose of the pre-data collection literature review for a quantitative research project concerning patient compliance with alternating leg pressure stockings (ALPs)? Group of answer choices It gives the researcher something with which to compare his or her findings on compliance with ALPs. It allows the researcher to construct theory about compliance with ALPs. It allows the researcher to discover previous research in the area of ALPs, so as to identify what is not known (the research gap). It allows the researcher to use the data from previous research on ALPs to add to his or her database.

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