Which of the following is NOT valid arrow function substitution for the function below?

let square $=$ function calculateSquare$($x$,$ y$)\{$

let result $=$ x $*$ y;

return result;

$\}$

A$)$ let square $=$ calculateSquare$($x$,$ y$)=>\{$

return x$*$y;

$\}$

B$)$ let square$=($x$,$ y$)=>\{$

return x$*$y;

$\}$

C$)$ let square $=($x$,$y$)=>$x$*$y;

Group of answer choices

A

B

C