$[10$ marks$]$

a$)$ Derive two classes, "passengerShip" $[$CLO$-2$: C$4-$PLO$-2]$

$(30$ marks$)$ additional attributes and behavior in eacl "navalShip", from the class "Ship" of Q$2($c$).$ Add some concept of polymorphism.

b$)$ How can you make the class "Ship" an abstract class?

$[15$ marks$]$

$[5$ marks$]$

c$)$ Draw the UML diagram of the classes "location", "Ship", "passengerShip" and "navalShip" and show the relationship among these classes. Can you elaborate "Has$-$A$"$ and $"$Is$-$A$"$ a relationship.

$[10$ marks$]$