In a job-shop production system, jobs of four different types arrive to the shop floor with equal probability. Each job has a different processing time on the first machine, called type A. There are four different identical machines of type A in the system to serve all the jobs. Jobs stand in one line in front of the group of the four machines of type A before they are loaded on the one of the four machines (based on first-come-first-served discipline). For modeling this in ARENA, you should chose the following option:

a. A DECIDE module that sends the job with a probability of 0.25 to one of four different PROCESS modules with a capacity of one resource in each PROCESS

b. None of the other choices

c. One PROCESS module with a capacity of four resources

d. One PROCESS module with a capacity of one resource