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Question 15 chapter 9 of k&B

 
Greenhorn
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And given these two fragments:
I. synchronized void chat(long id) {
II. void chat(long id) {
When fragment I or fragment II is inserted at line 5, which are true? (Choose all that apply.)
A. An exception is thrown at runtime
B. With fragment I, compilation fails
C. With fragment II, compilation fails
D. With fragment I, the output could be yo dude dude yo
E. With fragment I, the output could be dude dude yo yo
F. With fragment II, the output could be yo dude dude yo

when i run the programa the output with the two fragments is the same yo yo dude dude but the answer in the book is the F, ??
I can not understand why?
and if the real answer is de f ,why the d could not be too?
sorry for my english jeje
 
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Mauricio, this question has been asked many times before like here, here and here. See if any explanation from those topics can help you out...
 
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