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Which one of the following statements about Taylor's differential piecework system is true? Select one: O A. An employee whose output is sub-standard is compensated at a higher rate per unit. O B. When determining the remuneration, the standard rate per hour is first calculated. O C. While this system is meant to discourage employees from not maintaining the standard, it may be unfair on new employees. O D. A premium expressed as a percentage is determined for three categories of employees