Zend Preparation | PHP Quiz (Learning Mode)

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Which of the following will generate an E_NOTICE error assuming the following code?

    $array = array(
        array(
            1,2
        ),
        'a'=> array(
            'b'=>1,
            'c'
        )
    );

$array[] = 1;

echo $array[5][2];

echo $array[5][2] = 2;

isset($array[7][3][1]);