Which file contains information about currently mounted file systems ...
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/etc/inittab
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/etc/filesystems
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/etc/mtab
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/etc/fstab
C
Correct answer
Explanation
/etc/mtab contains information about currently mounted filesystems on Linux systems, dynamically updated by the mount command. /etc/fstab contains static configuration for filesystems to mount at boot, while /etc/inittab is for init system configuration. /etc/filesystems defines filesystem types but not mount status.