Question No. 2: (10 marks) (A): Ali owns a small tuck-shop. He wants to know the average number of customers queuing in his shop, to decide whether he needs to hire more salesmen to facilitate more customers. Currently 3 salesmen are serving the customers. As per estimation, on average, 30 customers arrive at his shop per hour. He determined that on average, a customer spends almost 5 minutes in his shop. Keeping in mind "Little's theorem" as a Network designer, how you will figure out this problem? Note: Calculation steps are necessary to be shown. (B): Transport layer manages end to end delivery of data. This layer has the ability to diagnose and combat Congestion control and Overflow. What is the main difference between these two parameters? Which technique is useful to avoid Overflow