Which of the following is the general form of function declarations in ML$?$

Group of answer choices

$($define $($function$\_$name formal$\_$parameters$)$ expressions$)$

$($defun function$\_$name $($formal$\_$parameters$)$ expressions$)$

function$\_$name formal$\_$parameters $=$ expressions

fun function$\_$name formal$\_$parameters $=$ expressions

let function$\_$name $=$ fun formal$\_$parameters $->$ expression