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What is the output of the following code?

What is the output of the following code?

class Number {

private $v;

private static $sv = 10;

public function __construct($v) { $this->v = $v; }

public function mul() {

return static function ($x) {

return isset($this) ? $this->v*$x : self::$sv*$x;

};

}

}

$one = new Number(1);

$two = new Number(2);

$double = $two->mul();

$x = Closure::bind($double, null, 'Number');

echo $x(5);

A.

5

B.

10

C.

50

D.

Fatal error

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