问题:
[单选题]假设$a=range(1,20,5),则print_r($a)的输出结果为( )。
A、Array ( [0] => 1 [1] => 6 [2] => 11 [3] => 16 )
B、Array ( [0] => 1 [1] => 20[2] => 5 )
C、Array ( [0] => 5 [1] => 10 [2] => 15 [3] => 20 )
D、Array ( [0] => 5 [1] => 10 [2] => 15 )
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