Consider the following statements regarding Comprehensive Nuclear-Test-Ban Treaty (CTBT).
- CTBT bans nuclear explosions everywhere: above ground, under water and underground.
- Number of nuclear tests has decreased globally since CTBT opened for signature.
- India has signed, but not ratified the CTBT.
- The Comprehensive Nuclear-Test-Ban Treaty (CTBT) bans all nuclear explosions, whether for military or peaceful purposes.
How many of the above statements is/are correct?