A company wants to prepare a 9-day counting schedule for 4 A items which it wants to count every 3 days. The company also wants to spread work evenly over the 9 days. Which of the following schedules best satisfies these criteria? Item Days 1 1,4,7 2 2,5,8 3 3,6,9 4 1,4,7 Item Days 1 1,4,7 2 2,5,8 3 3,6,9 4 4,7 Item Days 1 3,6,9 2 3,6,9 3 3,6,9 4 3,6,9 Item Days 1 1,3,5,7,9 2 2,4,6,8,10 3 1,3,5,7,9 4 2,4,6,8,10 Item Days 1 1,4,7 2 2,5,8 3 3,6,9 4 4,7,10