A Linux administrator needs to back up the folder /usr/domain, and the output must be a gzip compressed tar. Which of the following commands should be used? 

Answer options:

A. tar "cv domain.tar.gz /usr/domain
B. tar "cvf /usr/domain domain.tar.gz
C. tar "czvf domain.tar.gz /usr/domain
D. tar "cxzv /usr/domain domain.tar.gz

C

Reference: https://help.ubuntu.com/community/BackupYourSystem/TAR