If an experimental variable is such that exposure to it can be determined in an objective manner or an ex post facto basis, the ex post facto design becomes a/an

If an experimental variable is such that exposure to it can be determined in an objective manner or an ex post facto basis, the ex post facto design becomes a/an Correct Answer after only with control group design

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Article 20(1) protects against ex-post facto law. Ex-post facto law means