【C012017】往OuterClass类的代码段中插入内部类声明, 哪一个是错误的:

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public class OuterClass{

    private float f=1.0f;

    //插入代码到这里

}

• A.class InnerClass{
  
  public static float func(){return f;}
  
  }

• B.abstract class InnerClass{
  
  public abstract float func(){}
  
  }

• C.static class InnerClass{
  
  protected static float func(){return f;}
  
  }

• D.public class InnerClass{
  
   static float func(){return f;}
  
  }