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?