A network administrator needs to build a network including 5 subnets as shown in the following figure: Net 1: includes 10 network devices Net 2: includes 6 network devices Net 3: includes 18 network devices Net 4: includes 22 network devices Net 5: includes 17 network devices Net2 Net3 Net4 Net5 Net1 192.28.15.0 Internet a. Let's divide the IP addresses for the subnets and determine the subnet-mask corresponding to the class C IP address 192.28.15.0 b. Calculate the total number of usable IP addresses and deduce the remaining number of Ips c. If using all the network devices of the above 5 subnets in a single network, use the network address of 192.28.15.0. Calculate the number of IP addresses remaining in that network