EX 7.7 Write a recursive method to reverse a string. Explain why you would not normally use recursion to solve this problem. PP 7.4 Design and implement a recursive program that solves the Nonattacking Queens problem. That is, write a program to determine how eight queens can be positioned on an eight-by-eight chessboard so that none of them is in the same row, column, or diagonal as any other queen. There are no other chess pieces on the board.