Given that t1 is a reference to a live thread， which is true？（）

• 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.