How many subnets can be gained by subnetting 172.17.32.0/23 into a /27 mask, and how many usable host addresses will there be per subnet?（）
- A 8 subnets, 31 hosts
- B 8 subnets, 32 hosts
- C 16 subnets, 30 hosts
- D 16 subnets, 32 hosts
- E A Class B address can't be subnetted into the fourth octet.