Which command would you use to view interface usage details in real time?（）

A. It sends only five ping requests to the 172.18.1.1 destination.
B. It sends a continuous ping with a packet length of five bytes to the 172.18.1.1 destination.
C. It sends five rapid ping requests to the 172.18.1.1 destination.
D. It sends a continuous rapid ping with a packet length of five bytes to the 172.18.1.1 destination.

A. request system reboot
B. request system logout
C. request system halt
D. restart gracefully

A. /var/tmp/
B. /var/
C. /var/log/
D. /var/home/<username>/