[9] The labor mix variance is A. Actual total hours at actual mix times actual labor rates, minus actual total hours at actual mix times standard labor rates. B. Actual total hours at actual mix times standard labor rates, minus standard total hours at standard mix times standard labor rates. C. Actual total hours at actual mix times standard labor rates, minus actual total hours at standard mix times standard labor rates. D. Actual total hours at standard mix times standard labor rates, minus standard total hours at standard mix times standard labor rates