What does the following code display? public class RentalApp { public static void main(String[] args) { Rental r = new Rental(); r. setNumOfPersons(5); r. addPerson(); System. out. println(r. getNumOfPersons()); } } public class Rental { private int numOfPersons; public int getNumOfPersons() { return numOfPersons; } public void setNumOfPersons(int numOfPersons) { this. numOfPersons = numOfPersons; } public void addPerson() { numOfPersons = numOfPersons + 1; } } Group of answer choices 0 1 5 6