Question 4(40 marks)A tech support helpdesk receives support calls at an average rate of 5 calls per hour, and it takes 10 minutes on average to resolve a call. Currently, the helpdesk operates under an unlimitedcapacity policy.a) Average number of customers in the system3 marksb) Average time a customer spends in the system3 marksc) Average number of customers in queue3 marksd) Average waiting time in queue3 markse) Probability that the desk operator is idle5 marksf) Due to space constraints, the helpdesk considers limiting the number of waiting customers to c=4. Model this and compare performance metrics to those in a,b,c,d,e above.23 marks