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In a police line-up, the witness is asked to identify one criminal from a group of similar-looking people. If the authorities who conduct the line-up do not know which person is the suspected criminal, and the witness does not know either, then which experimental procedure is a police line-up most like?

a. A single-blind experiment.

b. A double-blind experiment.

c. A non-standard standard scientific experiment.

d. A field experiment.

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