What is output?public class Vehicle $\{$ protected String vehicleName; public void setName$($String name$)\{$ vehicleName $=$ name; $\}$ public String toString$()\{$ return vehicleName; $\}\}$public class Boat extends Vehicle $\{$ private int numEngines; public Boat$($int num$)\{$ numEngines $=$ num; $\}$ public String toString$()\{$ return super.toString$()+""+$ numEngines; $\}\}$Boat fastBoat $=$ new Boat$(2)$;fastBoat.setName$("$Firebird$")$;System.out.println$($fastBoat$)$;Question $21$ options:Firebird $2$FirebirdBoat@f$35$a$442$bSyntax error