Which of the following equations is used to calculate direct labor time variance? a.Direct labor time variance = (Actual direct labor hours + Standard direct labor hours) Standard rate per hour b.Direct labor time variance = (Actual direct labor hours + Standard direct labor hours) Actual rate per hour c.Direct labor time variance = (Actual direct labor hours Standard direct labor hours) Standard rate per hour d.Direct labor time variance = (Actual direct labor hours Standard direct labor hours) Actual rate per hour