What does the following code display?

public class Rental App $\{$

$$ public static void main$($String$[]$ args$)$

$\{$

$$ Rental r $=$ new Rental$()$;

$$ r$.$setNumOfPersons$(5)$;

$$ r$.$addPerson$()$;

$$ 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

$7$

$5$

$0$

$6$