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Broyle ?1 ,n non 7. If the class Manager extends the class Employee, which class is the superclass and which is the subclass? ?? 8. If a is a variable of type BankAccount that holds a non-null reference, what do you know about the object to which a refers? 9. If a referes to a checking account, what is the effect of calling a.transfer (1000, a)? a transtel al an beroun 10. What does this code fragment print? Why is this example of polymorphism? ? Also, explain your answer. DataSet data new DataSet()