what is best way to represent specialization/generalization hierachy if the participation and disjoint constraints are mandatory and disjoint? A)projectManager(empno,name,phone,project),...

what is best way to represent specialization/generalization hierachy if the participation and disjoint constraints are mandatory and disjoint?

A)projectManager(empno,name,phone,project), MachineOperator(empNo,name,phone,specialization)

B)employee(empno,name,phone,projManFlag,project,machOpeFlag,specialization)

C)employee(empno,name,phone), Employeedetails(empno,projManFlag,project,machOpeFlag,specialization)