Val has invoked the following command, to gather information about the data stored in her home directory.
$ du -sk * | sort -n | tail > file2
Which answer is correct concerning this command line?

A.
The sort filter takes stdin from the tail filter.

B.
The file called file2 must exist for the command to work.

C.
The sort filter uses stdout from the du command.

D.
The stdout from the tail filter will be appended to file2.