what is the output of this code snippet php a array..., PHP Arrays, PHP

Question:What is the output of this code snippet?
<?php

$a = array(0.001 => 'b', .1 => 'c');

print_r($a);

?>

A An empty array 
B 0.001 => 'b', .1 => c 
C 0 => 'c' 
D '0.001' => 'b', '0.1' => c' 
E A Syntax Error

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Question:What is the output of this code snippet?<?php$a = array(0.001 => 'b', .1 => 'c');print_r($a);?>