A manufacturer of automobile engines is designing a new Kanban system for engine #321. The demand for #321 is 79 parts per day, and the container can hold 7 parts at a time. The total processing and waiting time is 2 days. The manager wants a safety factor () of 2.4 or 240 percent. How many Kanbans are required in this system? If required, round your answer up to next whole number.

a. 77

b. 6

c. 32

d. 100