Given: class Vehicle{ int vno; String name; public Vehicle (int vno, String name){ this.vno = vno,; this.name = name; } public String toString (){ return vno + ":" + name; } } and this code fragment: Set<Vehicle>vehicles = new TreeSet <> (); vehicles.add(new Vehicle (10123, "Ford")); vehicles.add(new Vehicle (10124, "BMW")); System.out.println(vehicles); What is the result? 

Answer options:

A. 10123 Ford 10124 BMW
B. 10124 BMW 10123 Ford
C. A compilation error occurs.
D. A ClassCastException is thrown at run time.

D