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7.Variables can be divided into four categories: static, stack-dynamic, explicit heap-dynamic, and implicit heap-dynamic. Determine which category the following Java variables belong to. (a) Local variables (declared within methods) (b) Variables declared within an interface (c) Instance variables (declared within classes without using the word static) (d) Class variables (declared within classes using the word static) (e) Objects created using the word new (f) Arrays created using the word new (g) Arrays created without using the word new (h) String literals (i) Also, briefly explain the difference between implicit and explicit heap-dynamic variables