What are RET in this Situation?

In a human resource application, information of an employee is added by entering some general information. In addition to general information, the employee is salaried or hourly employee. The user has determined that an employee must be either salaried or hourly. Either type have information about dependencies. identify the RET in above situation.

For this example, there are three subgroups or RETs as shown below:

· Salaried employee (mandatory); includes general information
· Hourly employee (mandatory); includes general information
· Dependent (optional)