1. public class OuterC

1. public class OuterClass {  2. private double d1 = 1.0；  3. // insert code here  4. }  Which two are valid if inserted at line 3？（）  

• A static class InnerOne { public double methoda（） { return d1； } }
• B static class InnerOne { static double methoda（） { return d1； } }
• C private class InnerOne { public double methoda（） { return d1； } }
• D protected class InnerOne { static double methoda（） { return d1； } }
• E public abstract class InnerOne { public abstract double methoda（）； }