In view of the current status of our knowledge about the cell structure, which of the following statement(s) about cell theory is/are correct?
(i) The cell theory does not hold good since all living organisms are not cellular in organisation.
(ii) The cell theory in its modified form means that all living objects are composed of cells capable of reproduction.
(iii) The cell theory means that all living objects consist of cells, whether reproducing or not.
(iv) The cell theory needed modification due to the discovery of sub-cellular structures such as chloroplasts and mitochondria.