20. Provide 2 examples of each of the following (2 marks): a. The selection control structure. b. The iteration control structure. 21. Describe the meaning of coupling. (2 marks) 22. Describe the concept of code refactoring. (2 marks) 23. Write an if statement that compares if the contents of the two (2) strings below are the same. If the contents are the same, then print "the strings are the same to the terminal. (2 marks) String one = "hello"; String two = "goodbye"; 24. What class does the showMessageDialog method belong to? (2 marks)