שאלה | What is the difference between const, var, and let in JS?

What is the difference between const, var, and let in JS?

		There is no real difference except for the semantic marking of variables.
		const defines an unchangeable variable, let defines a changeable variable in a global namespace, var defines a changeable variable in a local namespace
		const defines a changeable variable, let defines an unchangeable variable in a local namespace, var defines an unchangeable variable in a global namespace
		const defines an unchangeable variable, let defines a changeable variable in a local namespace, var defines a changeable variable in a global namespace