4. (15 pt.) There are 5 departments in a company, named A, B, C, D, and E, which respectively involve 157, 108, 59, 25 and 16 hosts. Given IP prefix 10.10.10.0/23 for the company network, partition it into 5 subnets correspondingly for the 5 departments. Your results should be filled into the following table. Department Network Number Network Mask 1/2