please provide research objectives for research title "Workplace Attitude of Employees with Disabilities towards Building A Healthy Work Environment" with Dependent Variable (DV) and Independent Variable (IV) as below:

Dependent Variable (DV) = Healthy Work Environment

1. Independent Variable (IV) = working system 2. Independent Variable (IV) = working environment 3. Independent Variable (IV) = working colleagues 4. Independent Variable (IV) = work place attitude