Generic collection as return type in java Considering JavaChamp Flash

Question 203 / 297: Considering that all needed imports are there, what, inserted independently at line 1, will compile?
Choose 4

class A {}
class B extends A{}
class C extends B{}

public class Test {

	public List<? extends B> ring(){
		// line 1		
	}
}

return new ArrayList<B>();

return new ArrayList<C>();

return new ArrayList<A>();

return new ArrayList<? extends B>();

return new LinkedList<B>();

return new PriorityQueue<B>();

return new ArrayList();

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Explanation:

<? extends B> means B and any type that subType of B, which in this case is C.

A non generic List can be returned but a warning is caused at run time.

? is never used at instantiation.

The return type is a List, so ArrayList and LinkedList are valid returns.

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