Which statements about static inner classes are true？（）

• A、 A static inner class requires a static initializer.
• B、 A static inner class requires an instance of the enclosing class.
• C、 A static inner class has no reference to an instance of the enclosing class.
• D、 A static inner class has access to the non-static members of the outer class.
• E、 Static members of a static inner class can be referenced using the class name of the static inner  class.