Which system files are updated as devices are mounted and unmount to provide information on the mounted devices and the options used?

Which system files are updated as devices are mounted and unmount to provide information on the mounted devices and the options used? (Please specify TWO answers)

A.
/proc/dtab

B.
/etc/mtab

C.
/etc/fstab

D.
/proc/mounts

E.
/proc/devices