Interview

I would like to ask the following questions/tasks on a technical interview.

1. Implement a singleton.
   Yes, kinda boring question. But I'll expect simple implementation, like follows:
   
   public class Singleton{
     private Singleton(){}
     public static Singleton Instance = new Singleton();
   }
   
   and nothing more. There is no words about laziness. Anything more complicated signals about over-engineering.
2. Implement (I)Disposable pattern. And after it - When does a type need a finalizer?
   Second part is simple, first part is not good without explanation. In this case I'll wait for
   
   protected virtual void Dispose(bool isDisposing)
   
    
3. ...to be continued