Exam 200-550 topic 1 question 28 discussion

Which line of code can be used to replace the INSERT comment in order to output "hello"? class C { public $ello = 'ello'; public $c; public $m; function __construct($y) {
$this->c = static function($f) {
// INSERT LINE OF CODE HERE
};
$this->m = function() {
return "h";
};
}
}
$x = new C("h");
$f = $x->c;
echo $f($x->m);