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What is the output of the following code? class A { public $a = 1; public function
__construct($a) { $this->a = $a; } public function mul() { return function($x) { return
$this->a*$x; }; } } $a = new A(2); $a->mul = function($x) { return $x*$x; }; $m = $a->mul();
echo $m(3);

A.
9

B.
3

C.
6

D.
0

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