Given that a static method doIt（） in a class Work represents work to be done， what block of code will succeed in starting a new thread that will do the work？  
CODE BLOCK a：  
Runnable r = new Runnable（） {  
public void run（） {  
Work.doIt（）；  
}  
}；  
Thread t = new Thread（r）；  
t.start（）；  
CODE BLOCK b：  
Thread t = new Thread（） { 
public void start（） {  
Work.doIt（）；  }  }；  
t.start（）；  
CODE BLOCK c：  
Runnable r = new Runnable（） {  
public void run（） {  
Work.doIt（）；  
}  
}； 
 r.start（）； 
CODE BLOCK d：  
Thread t = new Thread（new Work（））；  
t.start（）；  
CODE BLOCK e：  
Runnable t = new Runnable（） { 
 public void run（） {  
Work.doIt（）；  
}  
}；  
t.run（）；  

What will be written to the standard output when the following program is run？（） 
public class Qd803 {  
public static void main（String args[]） {  
String word = "restructure"；  
System.out.println（word.substring（2， 3））；  
}  
}