An assembly line has three stations through which every unit being produced must pass in the same fixed order. The arrival of units follows a Poisson process for all stations. The mean time between arrivals is 8 minutes. The stations operate independently, and queues are allowed to form in front of each station All stations have some mean processing time of 4 minutes. If processing time at each station has an exponential distribution The average number of units in the assembly line is a less than 1. b. Greater than or equal to 1 but less than 3. c Greater than or equal to 3 but less than 5 ed Greater than or equal to 5 Clear my choice