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A.Cat
B.Dog
C.Compilation fails.
D.The code runs with no output.
E.An exception is thrown at runtime.

A.The Thread.sleep（） method can take t1 as an argument.
B.The Object.notify（） method can take t1 as an argument.
C.The Thread.yield（） method can take t1 as an argument.
D.The Thread.setPriority（） method can take t1 as an argument.
E.The Object.notify（） method arbitrarily chooses which thread to notify.