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Which of the following formulae is the correct formula to measure the efficiency variance? Select one: O Efficiency Variance = (Actual Quantity - Standard Quantity) * Actual Cost Efficiency Variance = (Actual Quantity + Standard Quantity) - Standard Cost O Efficiency Variance = (Actual Quantity - Standard Quantity) * Standard Cost O Efficiency Variance = (Actual Quantity = Standard Quantity) * Actual Cost O Efficiency Variance = (Actual Quantity - Standard Quantity) - Standard Cost