Инициализация членов класса

[Stalkert]

Подскажите ответ на вопрос, не смог ничего нагуглить

Where do you initialize a non-static class member that is a reference?

1. 
   

   Point of declaration only

   
   


2. 
   

   Member initialization list only

   
   


3. 
   

   Point of declaration and member initialization list

   
   


4. 
   

   Member initialization list and body of constructor

   
   


5. 
   

   Body of constructor only

   
   

 c++