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Which of the following is the correct formula for measuring an efficiency​ variance? A. Efficiency Variance​ = (Actual Quantity times Standard​ Quantity) / Standard Cost B. Efficiency Variance​ = (Actual Quantity​ / Standard​ Quantity) times Standard Cost C. Efficiency Variance​ = (Actual Quantity minus Standard​ Quantity) times Standard Cost D. Efficiency Variance​ = (Actual Quantity​ + Standard​ Quantity) minus Standard Cost