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 Can anyone explains the answers. [ November 18, 2006: Message edited by: Sanjeev Kumar Singh ]