What are the three elements of a standard work sheet? 

a. They are the processing time for an activity, the work sequence of all steps making up the activity, and the standard amount of inventory at the resource. 

b. They are the processing time for an activity, the most common cause of failure, and the standard amount of inventory at the resource. 

c. They are the defect rate for an activity, the work sequence of all steps making up the activity, and the standard amount of inventory at the resource. 

d. They are the processing time for an activity, the most common cause of failure, and the defect rate for an activity.