IP address assignment (15 points). Assume you are managing your company's class B network address 158.16.0.0/16. Suppose that four departments, A, B, C, and D, request 4000, 2000, 4000, and 800 addresses, respectively, and in that order. For each of these requests, please give the address and mask (in the CIDR notation) of the assigned subnet which minimizes the number of IP addresses wasted. 2