Consider a three sequentially stepped process named as Process A$,$ Process B$,$ and Process C$.$ Input comes into Process A$.$ Output from A goes into Process B$.$ Output from B goes into Process C$.$ Output of C is the final output. Suppose that it takes $2$ minutes per unit in Process A$,3$ minutes per unit in Process B and $1$ minute per unit in Process C$.$ Suppose further that Process A receives input at the rate of $30$ per hour. Where would you place a buffer?

Multiple Choice

in front of Process B

in front of both Process B and Process C

in front of Process A

in front of Process C

None of these choices are correct.