List three folders normally found at the root of a Linux file system and what the folder is typically used for.

What will be an ideal response?

bin for user programs and utilities (binary files)
sbin for system administration utilities (system binary files)
lib for runtime library files needed by programs stored in the /bin and /sbin directories
usr for user files and programs
var for files in which content often varies or that are used only temporarily
tmp for files used only temporarily
dev for devices
mnt for floppy drives, DVD/CD-ROM drives, flash drives, and other removable media
etc for system and configuration files
root for files used by the root account
home for users' home directories
proc for system resource tracking