Final answer:
All options mentioned—gender, age, sexual orientation, and disability—are legally protected from unfair discrimination in employment under U.S. federal law, enforced by the U.S. Equal Employment Opportunity Commission.
Step-by-step explanation:
All the following are examples of unfair discrimination: religion, national origin, race. These are grounds on which it is illegal to discriminate against an individual or group in employment and other areas in many jurisdictions, including under the United States federal law, which is enforced by the U.S. Equal Employment Opportunity Commission (EEOC).
However, the question seems to suggest that one of the mentioned categories (gender, age, sexual orientation, or disability) is not considered a form of unfair discrimination. From a legal standpoint, this is incorrect, as all these categories are protected under U.S. federal law, specifically in the context of employment.
The U.S. EEOC is responsible for enforcing federal laws that make it illegal to discriminate against a job applicant or an employee because of the person's race, color, religion, sex (including pregnancy), sexual orientation, national origin, age (40 or older), disability, or genetic information.