Consider the following program.

import

java.io$.*$;

class Teacher implements Serializable $\{\}$

class GuestTeacher extends Teacher $\{\}$

public class HeadFirstTeacher $\{$

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

Integer $[]$ quotas $=\{7,8,9,10\}$;

Teacher $t1=$ new Teacher$()$;

Teacher t$2=$ new GuestTeacher$()$;

Teacher $t3=$ new GuestTeacher$($