Which of the following have the R configuration? 
Definitions:
Correlation Coefficient
A statistical measure that calculates the strength and direction of a linear relationship between two variables.
Correlation
A statistical measure that describes the extent to which two variables change together, but does not imply causation.
Correlational Study
A type of research design where a researcher examines the relationship between two or more variables without manipulating them, determining whether and how they are related.
Double-Blind Experiment
A study or experiment in which neither the participants nor the researchers know who is receiving a particular treatment, to prevent bias.
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