You work as the Network Administrator for Perfect Solutions Inc. The company has a Linux-based
network. You are a root user on the Red Hat operating system. You want to keep an eye on the
system log file /var/adm/messages. Which of the following commands should you use to read the
file in real time?

A.
tail -n 3 /var/adm/messages

B.
tail /var/adm/messages

C.
cat /var/adm/messages

D.
tail -f /var/adm/messages