3. Assume that we have 4 classes (One, Two, Three and Four) and variables of each of these classes are: One oneob; Two twoob; Three threeob; Four fourob; The following assignments are all legal: oneob = fourob; oneob = threeob; twoob = fourob; The following assignments are illegal: twoob = oneob; twoob = threeob; threeob = twoob; Draw the class diagram to show relationship between One, Two, Three and Four based on given legal and illegal assignments. (Hint: Use Subtype/Supertype concept) 3 Marks