Number of Fields in /etc/fstab

D

The /etc/fstab file is a system configuration file used in Linux and Unix-based operating systems. It contains information about file systems and devices that are mounted at boot time.

Each line in the /etc/fstab file describes a single file system and follows a specific format. The format consists of several fields separated by whitespace, such as spaces or tabs.

The correct answer to the question is B. 4 fields.

The four fields in a syntactically correct line of /etc/fstab are:

1. File system - the file system's block device or remote file system to be mounted.
2. Mount point - the directory where the file system will be mounted.
3. File system type - the type of file system to be mounted, such as ext4, nfs, or swap.
4. Mount options - a comma-separated list of options that control how the file system is mounted, such as read-only or noauto.

For example, a typical entry in /etc/fstab might look like this:

bashCopy code
/dev/sda1 / ext4 defaults 0 1 

In this example, the four fields are:

1. /dev/sda1 - the block device that contains the file system to be mounted
2. / - the mount point directory
3. ext4 - the file system type
4. defaults - the mount options

Note that there are two additional fields in this example - 0 and 1. These fields are used by the system to determine the order in which file systems are checked at boot time and whether they should be automatically backed up by dump. However, these fields are not part of the basic syntax of /etc/fstab and are not necessary for a syntactically correct line.