Programming Project 6.12 asked you to write a BoxOfProduce class that stored three bundles of fruits or vegetables (stored in an array of strings of size 3) to ship to a customer. Rewrite this class to use a vector instead of an array and add appropriate constructors, mutators, and accessors. The class should have a function to add additional fruits or vegetables to the box so there could be more than three bundles in one box. The output function should output all items in the box. Overload the + operator to return a new BoxOfProduce object that combines the vector contents of both operand BoxOfProduce objects. Test your functions and + operator from the main function. You do not have to implement the rest of Programming Project 6.12 for this Programming Project, only the changes to the BoxOfProduce class.