Consider the system composed of four processes linked by a conveyor bell. There is no storage between these processes petured below and market demand ef $40$ units per hour drives the conveyor belt. Assume that no defective units are made. Which statement is best?Process $1$InvantoryuntsProcess $2$Inventory$5$ unitsProcess $31$Inventory$6$ unitsProcess $4/$Select one:O A$.$ The flow rate through the entire process is $160$ units per hour. B$.$ The avorage time a unit soond in Process $1$ is $2$ and a half minutes.O C$.$ The average time a unit spends in Process $2$ is $5$ minutes. D$.$ The flow time for a unit through the entire process is $30$ minute:.