According to the text,what research term refers to the truthfulness of a method?

Question

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Validity refers to the degree to which a research method measures what it claims to measure, or the truthfulness of a method. Reliability refers to the consistency and stability of a research method over time or across different researchers. Correlation refers to the strength of the relationship between two variables. Generalization refers to the extent to which research findings can be applied to a larger population beyond the studied sample.

According to the Text,what Research Term Refers to the Truthfulness