Question $22$

You are reviewing a code snippet written in Mozart Oz$.$ The code defines a function called Minus, which is intended to take an argument X$.$ Here is the Mozart Oz code:

Declare

fun $\{$ Minus $x\}$

$x$

end

$\{$Browse $\{$Minus $15\}\}$

What is the output of the program?

$-15$

$15$

$0$

Error: Invalid operation