问题：

[多选]

Which statements concerning the following code are true？（）  
class a {  
public a（） {}  
public a（int i） { this（）； }  
}  
class b extends a {  
public boolean b（String msg） { return false； } 
 }  
class c extends b 
{  private c（） { super（）； } 
 public c（String msg） { this（）； } 
 public c（int i） {} 
 }  

A . The code will fail to compile.
B . The constructor in a that takes an int as an argument will never be called as a result of constructing an  object of class b or c.
C . Class c has three constructors.
D . Objects of class b cannot be constructed.
E . At most one of the constructors of each class is called as a result of constructing an object of class c.