Consider a 10 Mbps link shared by multiple users with 0.5 Mbps ports who are each active about 20% of the time. If bandwidth allocation is done using circuit switching (packet switching), how many users can be supported? O a) 10 users in circuit switching, 50 users in packet switching O b) 20 users in circuit switching, 100 users in packet switching c)20 users in circuit switching, 20 users in packet switching Od) None of the above