Question: A PHP "variable variable" takes the value of a variable and treats that as the name of a variable. For example, if `$var` is a variable then `$$var` is a variable variable whose name is the value of `$var`. Which script produces the output below, using variable variables?

1. [ ]
2. [ ]
3. [x]
4. [ ]

Answer: The correct answer of the above question is Option C:[x]