A Linux Administrator Tried to Copy Files to a Remote

Multiple Choice

A Linux administrator tried to copy files to a remote server but received an error message indicating a lack of free space on the disk. The administrator issued a df command and verified adequate free space and inodes on the filesystem. Which of the following commands is the BEST way to diagnose the issue?

A) cat /proc/meminfo
B) lsof -nP | grep deleted
C) find / -type f -size +50M
D) du -a / | sort -n -r | head -n 30