There are three responses to the Queen's Gambit...
		
		
	 
	
		
			If black takes the pawn...
		
		
	 
	
		
			The opening becomes the Queen’s Gambit Accepted
		
		
	 
	
		
			If black protects the pawn with his King pawn
		
		
	 
	
		
			The opening becomes the Queen’s Gambit Declined
		
		
	 
	
		
			And If black protects the pawn with his King's Bishop pawn
		
		
	 
	
		
			The opening becomes the Slav Defense