). Suppose a group of users share a 1 Mbps link. Each user requires 100 Kbps when transmitting, but each user transmits only 20% of the time. a. (10 points) When circuit switching is used, how many users can be supported? b. (15 points) Suppose packet-switching is used. If there are 50 users, use the binomial distribution to compute the probability that more than 10 of the 50 users are transmitting simultaneously at any given time. (Hint: You can write a program to compute this probability.)