Briefing Zend Knowledge

What is the output of the following script?

seenagape

What is the output of the following script?
<code>
1 <?php
2 class a
3 {
4 public $val = 10;
5 }
6
7 function renderVal (a $a)
8 {
9 return $a->$val;
10 }
11
12 renderVal (new a);
13 ?>
</code>

A.
Nothing

B.
NULL

C.
A fatal error

D.
$val

E.
10