php a0 1 a1 3 a2 5 result count a printr..., PHP Arrays, PHP

Question:<?php
 $a[0] = 1;
 $a[1] = 3;
 $a[2] = 5;
 $result = count($a);
print_r($result);
?>
 What will be the output?

A 3 
B Array([0]=>3) 
C 2

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Question:<?php $a[0] = 1; $a[1] = 3; $a[2] = 5; $result = count($a); print_r($result); ?> What will be the output?