Design subnets meet the following requirements: The available IP address space is the range 10.10.172.0-10.10.172.255. You may only assign IP addresses in this range. The LAN connected to router A must be able to support at least 50 hosts. The LAN connected to router B must be able to support at least 75 hosts. The LAN connected to router C must be able to support at least 20 hosts. Design the subnets (showing the mask and the first and last addresses in each subnet) using variable length subnet masks. [Assume the address blocks include addresses where the host ids are all zeros and all ones.]