Which of the following commands is the BEST way to diagnose the issue?

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

Answer: B