多项选择题

1. class HorseRadish {  
2. // insert code here  
3. protected HorseRadish(int x) { 
4. System.out.println("bok choy");  
5. }  
6. }  
7. class Wasabi extends HorseRadish {  
8. public static void main(String [] args) {  
9. Wasabi w = new Wasabi(); 
10. }  
11. }  
分别插入到第 2 行,哪两项允许代码编译并产生"bok choy" 输出结果?()  

A. // just a comment
B. protected HorseRadish() { }
C. protected HorseRadish() { this(42);}
D. protected HorseRadish() { new HorseRadish (42);}

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