Please help.

Can you please give me the answer by letter (A,B,C etc.)

31. For the following image, list in the answer box the following: 1. The OSI Layer of the Firewall/Router and switch (A,E) 2. For the network server, the DNS Address should be a Google DNS Server (B) 3. For all subnet addresses, we are using the class A subnet mask (C,I and L) 4. The gateway address is the Firewall address (D,M,I) 5. The network server is running DNS for the network as well as DHCP with a range of 10.10.20.100-10.10.20.200. Fill in appropriate addresses for F and J as well as DNS Addresses for G and K. Make sure to put the answer letter (A, B, etc) with your answer and in order