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concurrent acess

 
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Which of the following pairs of method invocations could NEVER be executing at the same
time? (Choose all that apply.)
A. x.a() in thread1, and x.a() in thread2
B. x.a() in thread1, and x.b() in thread2
C. x.a() in thread1, and y.a() in thread2
D. x.a() in thread1, and y.b() in thread2
E. x.b() in thread1, and x.a() in thread2
F. x.b() in thread1, and x.b() in thread2
G. x.b() in thread1, and y.a() in thread2
H. x.b() in thread1, and y.b() in thread2


The answer in K& B Self test book is bit confusing(Page 754).
 
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Are A,F and H the correct answers???
 
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