Final answer:
The protected classes according to the discrimination policy in the question are age, sexual orientation, and religion. These are enforced by the EEOC and are explicitly listed in Title VII of the Civil Rights Act of 1964. Caste is not a recognized protected class under U.S. federal employment discrimination laws.
Step-by-step explanation:
According to federal law, particularly the Civil Rights Act of 1964 and subsequent rulings and legislation, there are several protected classes that cannot be discriminated against in the workplace. Among these, the options provided in the question include age, sexual orientation, and religion. Each one of these is recognized as a protected class under federal law. Caste is not recognized as a protected class under U.S. federal employment discrimination laws.
The U.S. Equal Employment Opportunity Commission (EEOC) enforces laws that prohibit job discrimination based on age (40 or older), race, color, religion, sex (including pregnancy), sexual orientation, national origin, disability, or genetic information. In particular, Title VII of the Civil Rights Act explicitly prohibits discrimination based on race, gender (which includes sexual orientation and gender identity as of a 2020 Supreme Court ruling), national origin, and religion.
Therefore, the correct answer to which of the provided options is a protected class would be A. age, C. sexual orientation, and D. religion.