Which of the following commands changes the number of days before the ext3 filesystem on...

The correct command to change the number of days before the ext3 filesystem on /dev/sda1 has to run through a full filesystem check while booting is tune2fs -i 200 /dev/sda1. This command sets the interval between two filesystem checks to 200 days. The tune2fs command allows you to view and change various filesystem parameters on Linux ext2, ext3, or ext4 filesystems. The -i option specifies the time interval between checks. The other options are incorrect because they use the wrong parameters for the tune2fs command. Option A is wrong because the -d option is not supported by the tune2fs command. Option B is wrong because the -c option sets the maximum number of mounts, not days, before a check. Option D is wrong because the -n option is not supported by the tune2fs command. Option E is wrong because the --days option is not supported by the tune2fs command. References:

[LPI Linux Essentials - 2.2 Mounting, Unmounting Filesystems]

15 tune2fs command examples in Linux [Cheat Sheet] - GoLinuxCloud

Linux tune2fs command With Examples - GeeksforGeeks

tune2fs command-file system management - Linuxstar

tune2fs Command Examples - Gianforte School of Computing