下面程序段的输出结果是（）。 class Test{ public s，tatic void main(String args[]){ MyThread t=new MyThread； displayOutput("t has been createD")； start； } } Class MyThread extends Thread{ public void displayOutput(String s){ System．out．println(s)； } public void run{ displayOutput("t is running．")； } }

A. t has been created．
B. t has been created． t is running．
C. t is running．
D. 编译出错