Which command is used to backup in DOS 6+ Version

In Disk Operating System (DOS) versions 6 and later, the command used for backup is MSBACKUP. MSBACKUP is a utility provided by Microsoft to perform backup operations, allowing users to back up files and directories to another location such as a floppy disk or another hard drive.

Option A, "BACKUP," is not a standard DOS command for backup operations in DOS versions 6 and later.

Option C, "MSBACKEDUP," is not a valid DOS command.

Therefore, the correct answer is Option B: MSBACKUP.