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9. In PHP 4, which object-oriented constructs from the following list are not available?
• Abstract classes
• Final classes
• Public, private, protected (PPP) methods
• Interfaces


Вариант ответа 1 - A) Abstract classes

Вариант ответа 2 - B) PPP methods

Вариант ответа 3 - C) Neither PPP methods nor interfaces

Вариант ответа 4 - D) None of the above are available

Вариант ответа 5 - E) All of the above are available


Comments: In PHP 4, there is no concept of any of the classic object-oriented constructs listed in the question (although many were introduced in PHP 5), so Answer D is correct.

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