what will be the output of following code arr a arr0..., PHP Fundamentals, PHP

Question:What will be the output of the following code?
$arr = "a";
$arr[0]="b";
echo $arr;
echo $arr[0];

A ab 
B $arr is undefined 
C bb 
D Parse error

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Question:What will be the output of the following code?$arr = "a";$arr[0]="b";echo $arr;echo $arr[0];