A.
Any host, from any network, may use this server as its main DNS server.
B.
If the server doesn’t know the answer to a query, it sends a recursive query to 192.168.0.4.
C.
If the server doesn’t know the answer to a query, it sends a query to a root DNS server.
D.
Hosts in the network 10.0.0.0/24 will be able to ask for zone transfers.
E.
If the server doesn’t know the answer to a query, it sends a recursive query to 192.168.0.4 and,
if this fails, it returns a failure.