QUESTION $4[50$ points$]$

Consider a fuel station automation software is required. The automation system will keep track of fuel tanks, personnel, pumps, customers, sales and will prepare appropriate reports. The following data are necessary to be kept by the system.

TANKS : TankNumber, Fuel Type, Capacity, Current Level PERSONNEL : ID$,$ Name, Blood Type

CUSTOMER : ID$,$ Name, Address

PUMPS : Pump Number, Serial Number, Connected Tank

SALES : ID$,$ Sales Date and Time, Amount, Personnel ID$,$ Customer ID$,$ Pump Number The following system functions are also requested:

CRUD $($Create$-$Read$-$Delete$-$Update$)$ opeations for all type of information

After each sale, a "sales receipt" must be printed

Each sale is initiated by the identification of the personnel by a special hardware $($smart card, touch button etc.$)$

Registered customers should present their identity by means of a special hardware before the refill

System should allow fuel sales for unregistered customers

Manager of the station requires a daily sales report in the end of shifts

Only the manager can set the new prices in the pump machine $($by means of the automation system$)$

a$)[15$ points$]$ Draw UML Use Case Diagrams.

b$)[20$ points$]$ Draw UML Class Diagrams $($attributes$,$ methods, and relationships$).$

c$)[15$ points$]$ Draw UML Sequence Diagram for "sale".