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What is the output of the following code?

What is the output of the following code?

class C {

public $x = 1;

function __construct() { ++$this->x; }

function __invoke() { return ++$this->x; }

function __toString() { return (string) --$this->x; }

}

$obj = new C();

echo $obj();

A.

0

B.

1

C.

2

D.

3

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