An investment fund that has more than one class or series that are referable to the same portfolio may treat each class or series as a separate investment fund for the purposes of this Form, or may combine disclosure of one or more of the classes or series in one prospectus. If disclosure pertaining to more than one class or series is combined in one prospectus, separate disclosure in response to each item in this Form must be provided for each class or series unless the responses would be identical for each class or series.