Question 4 (30 points) A computer repair shop receives 2 kinds of service jobs: repairs and upgrades. The arrival rates of repairs and upgrades are 2.0 and 1.5 per hour, respectively. The interarrival times have the exponential distribution. All arriving jobs are first being handled by technicians. When a technician completes the repair or upgrade, the computer is sent to the quality specialist for testing. Upgrades do not need any further operations and leave the shop whereas 20% of all repairs fail the quality test and are sent back to the technicians. This percentage is the same no matter how many times they have been attended by a technician. After passing the quality test any repair job that has failed the quality test more than once is examined by the manager before it leaves the shop. If the repair job has not failed the quality test or failed only once then it leaves the job without visiting the manager. Technician time for repairs and upgrade jobs both have the triangular distribution with parameters (10,20,40) and (5,10,15) minutes, respectively. Quality testing time for repairs and upgrade jobs both have the uniform distribution with parameters (8,16) and (7,12) minutes, respectively. Manager examination time also has the uniform distribution with parameters (10,20) minutes. There are 2 technicians, 1 quality specialist, and 1 manager at the shop. Only draw an Arena simulation model with modules and connectors