Which of the following is NOT a protected class under the federal Fair Housing Act?

The federal FAIR HOUSING ACT (Title VIII, 1968, as amended) prohibits housing discrimination based on: RACE; COLOR; NATIONAL ORIGIN; RELIGION; SEX (gender); FAMILIAL STATUS (families with children under 18); DISABILITY (physical or mental). Occupation, income level, occupation type, age (except for age-restricted senior housing exemptions), sexual orientation, and source of income are NOT protected under federal law — though many state and local laws add these protected classes. The exam frequently presents scenarios and asks whether discrimination occurred and whether the protected class applies.