Three types of packets arrive at a router port. Ten percent of the packets are “expedited forwarding (EF),” 30 percent are “assured forwarding (AF),” and 60 percent are “best effort(BE).”(a) Find the probability that k of N packets are not expedited forwarding.(b) Suppose that packets arrive one at a time. Find the probability that k packets are received before an expedited forwarding packet arrives.(c) Find the probability that out of 20 packets, 4 are EF packets, 6 are AF packets, and 10are BE.