Which file could this be from?

The following output shows an excerpt from a standard network configuration file:

time  37/udp timeserver
rlp   39/udp
name  42/udp nameserver
whois 43/tcp nickname

Which file could this be from?

A.
/etc/hosts

B.
/etc/inetd.conf

C.
/etc/named.conf

D.
/etc/services

E.
/etc/syslog.conf

Explanation/Reference:
/etc/services is a plain ASCII file providing a mapping between human-friendly textual names for internet services, and their underlying assigned port numbers and protocol types.