3. (5 pts) Write a method that sums all the numbers in the major diagonal in an nxn Array of double values using the header below. The method returns the sum. public static double sumMajorDiagonal(double[][] m) 4. (5 points) Write Java code to define a class called Product containing the following information: name, price, and with one constructor method, one accessor method and one mutator method (hand-write, please). Answer: public class Product