In the following shell script snippet the variable FILES holds $($select the best answer$)$:

#$!/$bin$/$bash

$...$

FILES$=`$ls$`$

The string $\text{'}$ls$\text{'}$

A single long string consisting of names of all files in the current directory, returned by the Linux ls program

A list of strings, with the value of each string being the name of one of the files in the current directory, returned by the Linux ls program

The Linux ls program executable code