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Answer the following questions: 1) What is a problem? 2) What is the best method to decide? 3) Write an example that you had to make a serious decision? What did you do? 4)

Hi, Please write in question and answer format.List three approaches to message authentication.What is a message authentication code?What properties must a hash function have to be useful for message authentication?In

<p>In this exercise, you will build a simple Java application thatcalculates the weekly average of temperatures and then converts itfrom Fahrenheit to Celsius.</p><p>1. When the application starts, it asks for