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Which of the following did not result in an output error in PHP 4 but...

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Which of the following did not result in an output error in PHP 4 but does in PHP 5?

A.

Using 'var' as an access modifier.

B.

Assigning a new object instance to $this in a constructor.

C.

Passing an object by-reference.

D.

Passing an object by-value.

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