Which of the following directories in Linux operating system contains device files, which refers to physical devices?

/boot contains the bootloader and kernel image files required to start the system, not device files.

/etc contains host-specific system-wide configuration files and has no role in representing physical devices.

The /dev directory follows the Linux Filesystem Hierarchy Standard and contains device files such as /dev/sda for block storage devices and /dev/tty for terminal devices, which allow the kernel and user-space applications to interact with hardware using the standard file I/O interface. These files are not regular files but special inodes managed by the kernel's device driver subsystem.

/bin contains essential user-space command binaries required in single-user mode and is unrelated to device representation.