OOP in PHP4

[vishwavivek]

I have doubt in following question.

Q. What OOP construct <B>unavailable</B> in PHP 4 does the following script approximate?

<?php
class my_class
{
function my_funct ($my_param)
{
user_error ("Please define me", E_ERROR);
}

function b()
{
	return 10;
}

}
?>

A. Multiple inheritance
B. Interfaces
C. Abstract methods
D. Private methods
E. Function overloading

Can anyone explain this to me ... what is being tried to ask in this question .. and what is the correct answer & why.

Thanks for your time.

Vivek

[halojoy]

if you give a link to where you found it,
I would maybe be able to answer. English is also only my second language.
Generally, ripping some text out of its context, can give very strange results.
Same goes for PHP code sometimes,
will be very hard to see what is problem, if only have a few lines.

[Weedpacket]

How many marks is this worth?