wwwwwwwwwww. Implement a static method, called listRange, that takes one input parameter called head of type IntNode that represents the head of a linked list. The method then finds and returns the difference between the maximum and minimum values in the linked list. For example, the range of the following linked list is 60 (which is 70 - 10). Assume the list include only positive integers. The methods returns -1 if the list is empty. head 20-->60-->10-->50-->70-->30, null Exercise 4: reflect on your learning this week 1- What is the most important thing you learned in this week's lecture? Write 2-3 sentences to explain your answer. Windows 2- What is the muddiest (most-unclear) point(s) in this week's lecture? Explain why?ngs to activate Windows.