Which TWO of the following statements about the tcp_wrappers configuration files are correct?

Which TWO of the following statements about the tcp_wrappers configuration files are correct?

A.
Both files must be edited, to get tcp_wrappers to work properly

B.
It is possible to configure tcp_wrappers using just one file

C.
(x) inetd requires these files

D.
All programs that provide network services use these files to control access

E.
tcpd uses these files to control access to network services