Internal command in Dos are

Internal commands in DOS are those commands that are built into the operating system and do not require an external program or file to be executed. The internal commands that are available in DOS may vary depending on the version of DOS that is being used.

Out of the options given, only option C consists of internal commands in DOS:
#1 Time: displays or sets the system time.
#2 Type: displays the contents of a text file on the screen.
#3 Dir: displays a list of files and subdirectories in a directory.

Option A consists of two commands, 'Cls' and 'rd label'. 'Cls' is an internal command in DOS that clears the screen. 'rd label' is not an internal command in DOS; it is a command to remove a directory.

Option B also consists of three commands, 'Dir', 'ren', and 'sys'. 'Dir' is an internal command in DOS. It displays a list of files and subdirectories in a directory. 'Ren' is also an internal command that is used to rename a file or a directory. 'Sys' is not an internal command in DOS.

Option D consists of three commands, 'Del', 'disk copy', and 'label'. 'Del' is an internal command in DOS that is used to delete a file. 'Disk copy' is not an internal command in DOS; it is a command to copy the contents of one floppy disk to another. 'Label' is also an internal command in DOS that is used to create, change or delete the volume label of a disk.