If a user wishes to monitor the last three lines of the log file messages.log and update it every 15 seconds, which of the following commands should be issued?
A.
follow -f -s 15 -n 3 messages.log
B.
tail -f -s 15 -n 3 messages.log
C.
sar -f -s 15 -n 3 messages.log
D.
watch -f -s 15 -n 3 messages.log
B