The sum of the elements of an integer-valued array recursively calculated as follows: The sum of an array of size 0 is 0; Otherwise, the sum of the first n elements of an array is the sum of the last of these added to the sum of the previous n-1 elements. Write an int method named sum that accepts an integer array, and the number of elements in the array and returns the sum of the elements of the array. The sum of the elements of an integer-valued array recursively calculated as follows: The sum of an array of size 0 is 0; Otherwise, the sum of the first n elements of an array is the sum of the last of these added to the sum of the previous n-1 elements. Write an int method named sum that accepts an integer array, and the number of elements in the array and returns the sum of the elements of the array.