76. Given:
1. class TestA{
2. public void start(){System.out.println("TestA")；}
3. }
4. public class TestB extends TestA{
5. public void start(){System.out.println("TestB")；}
6. public static void main(String[] args){
7. ((TestA)new TestB()).start()；
8. }
9. }
What is the result?
(A) TestA
(B) TestB
(C) Compilation fails.
(D) An exception is thrown at runtime.
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