Identify a true statement about benefit plans and seniority systems under the Age Discrimination in Employment Act $($ADEA$).$

Multiple choice question.

Benefit plans must be truly voluntary.

Having a short time to reach a decision about accepting retirement options renders the decision involuntary.

The ADEA specifically includes bona fide retirement plans that distinguish based on age.

The determination of what qualifies as a bona fide plan cannot be made on a case$-$by$-$case basis.