public class OuterClass { 
private double d1  1.0； 
//insert code here  
}  
You need to insert an inner class declaration at line2. Which two inner class declarations are valid？（） 

A. The default constructor initializes method variables.
B. The default constructor invokes the no-parameter constructor of the superclass.
C. The default constructor initializes the instance variables declared in the class.
D. If a class lacks a no-parameter constructor，， but has other constructors， the compiler creates a default constructor.
E. The compiler creates a default constructor only when there are no other constructors for the class.

A. Public
B. Private
C. Protected
D. Transient
E. No access modifier is required.

A. Abstract public void methoda（）；
B. Public abstract double methoda（）；
C. Static void methoda（double d1）{}
D. Public native double methoda（）  {}
E. Protected void methoda（double d1）  {}