Java Inheritance and Object Instantiation

Question

Consider the following class definitions.
```
public class Bookshelf {
   private int bookCount;
  Bookshelf () {
    bookCount = 5;
   }
  Bookshelf(int count) {
    bookCount = count;
   }
   public int countBooks() {
    return bookCount;
   }
}
public class NovelCollection extends Bookshelf {
  NovelCollection() {
    super(8);
  }
}
```
Which of the following code segments will compile without error?

Accepted Answer

Bookshelf b2 = new NovelCollection(); 
int novels = b2.countBooks();

Answer

Bookshelf b1 = new NovelCollection(15);

Answer

NovelCollection n2 = new Bookshelf();

Answer

NovelCollection n1 = new NovelCollection(10);

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