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?
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
