Which of the Following Is a Principle of Workcenter Scheduling

Which of the following is a principle of workcenter scheduling?

A) Once started, a job can and should be finished even if unavoidably interrupted.
B) Reschedule every day.
C) Achieve certainty in standards and routings.
D) Give workcenters less to do then their maximum.
E) Assign the first worker to all of the days that require staffing.