what is the output of following php a 010 b 0xa..., PHP Fundamentals, PHP

Question:What is the output of the following?<?php

$a = 010;
$b = 0xA;
$c = 2;

print $a + $b + $c;

?>

A 20 
B 22 
C 18 
D $a is an invalid value 
E 2

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Question:What is the output of the following?<?php $a = 010; $b = 0xA; $c = 2; print $a + $b + $c; ?>