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In the example

public class A
{
 public static int X;
 internal static int Y;
 private static int Z;
}
internal class B
{
 public static int X;
 internal static int Y;
 private static int Z;
 
 public class C
 {
 public static int X;
 internal static int Y;
 private static int Z;
 }

 private class D
 {
 public static int X;
 internal static int Y;
 private static int Z;
 }
}

the classes and members have the following accessibility domains:

• The accessibility domain of A and A.X is unlimited.
• The accessibility domain of A.Y, B, B.X, B.Y, B.C, B.C.X, and B.C.Y is the program text of the containing program.
• The accessibility domain of A.Z is the program text of A.
• The accessibility domain of B.Z and B.D is the program text of B, including the program text of B.C and B.D.
• The accessibility domain of B.D.X and B.D.Y is the program text of B, including the program text of B.C and B.D.
• The accessibility domain of B.D.Z is the program text of B.D.