Consider the following nuclear disarmament treaties at a global level:
1. Partial Test Ban Treaty (PTBT), 1963
2. Treaty on the Non-Proliferation of Nuclear Weapons (NPT), 1967
3. Comprehensive Nuclear Test Ban Treaty (CTBT), 1996
4. Treaty on the Prohibition of Nuclear Weapons (TPNW), 2017
How many of the above given treaties are signed and ratified by India?