What Does It Mean for an Experiment to Be Double-Blinded

What does it mean for an experiment to be double-blinded?

A) The researcher does not know which participants are in the treatment and control groups.
B) The participants do not know who is in the treatment and control groups.
C) Neither the researcher nor the participants know who is in the treatment and control groups.
D) The researcher and the participants know which group they are in because it is unethical to keep this information from them.

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