Which of the Following Configuration Files Are Used by Tcpwrapper

Which of the following configuration files are used by tcpwrapper?

A) /etc/tcpd.allow and etc/tcpd.deny /etc/tcpd.allow and etc/tcpd.deny
B) /etc/tcpwrapper.allow and /etc/tcpwrapper.deny /etc/tcpwrapper.allow /etc/tcpwrapper.deny
C) /etc/hosts.allow and /etc/hosts.deny /etc/hosts.allow /etc/hosts.deny
D) /etc/service.allow and /etc/service.deny /etc/service.allow /etc/service.deny