2) (25 pts) Consider implementing subnetting to support three departments within an organization. The three departments P, Q and R need support for Np, N, and Nr hosts. Choose an appropriate class-based address space to do the subnetting. Compute the following for each of the three subnets. Also, compute the efficiency of your IP address assignment. Show all the work in detail. a) Subnet mask b) Subnet address c) Subnet broadcast address d) Valid range of unicast IP addresses "NP" hosts "N," hosts "Ne" hosts 800 900 1000