I am currently in the process of filing my I-140 at NSC and I have a choice of CP vs AOS. I would prefer the CP option but in light of the current situation in India, I would want to have the option to move to AOS if I find that the situation worsens after 2 months. Do I need to file 824 for that upon 140 approval. I am aware that for change from AOS to CP one needs to file 824 but is this needed for the other way around. If not.. what needs to be done?