Question from the PHP7 test

<?php

$a = new \Some\namespace\ClassA;
$b = new \Some\namespace\ClassB;

<?php

use Some\namespace\ClassA;
use Some\namespace\ClassB;

$a= new ClassA;
$b= new ClassB;

<?php

use Some\namespace\{ClassA, ClassB};

$a= new ClassA;
$b= new ClassB;