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What is the output of the following script?

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What is the output of the following script?

1

2 class a

3 {

4 public $val;

5 }

6

7 function renderVal (a $a)

8 {

9 if ($a) {

10 echo $a->val;

11 }

12 }

13

14 renderVal (null);

15 ?>

A.

A syntax error in the function declaration line

B.

An error, because null is not an instance of 'a'

C.

Nothing, because a null value is being passed to renderVal()

D.

NULL

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