Which of the following commands will display the last 30 lines of /var/log/bigd.log as well as new content as it is appended to the file by another process?

A.
tac.30/var/log/bigd.log

B.
cat -r-n 30/var/log/bigd.log

C.
cut /var/log/bigd.log

D.
tail -f-n 30/var/log/bigd.log

E.
head.30-e/var/log/bigd.log