Which of the following statements regarding Biological and Toxin Weapons Convention (BTWC) are correct?
1. The BTWC prohibits the development, production, acquisition, transfer, stockpiling and use of biological weapons.
2. India is signatory but not ratified the Convention
3. US, Russia, Ukraine and Israel are parties to the Convention
4. The Convention has a exemption clause where in biological toxins are permitted for protective and peaceful purpose