Which action does a noncontributory group plan require from employees?

A noncontributory group plan mandates that 100% of eligible employees participate in the plan. This requirement is the defining characteristic of noncontributory plans; there are no contributions required from employees for premiums, which means the employer assumes the full cost of the insurance. As such, every eligible employee must be enrolled in the plan, ensuring that the risk is spread across all members, which in turn helps keep premiums lower for everyone involved.

In contrast, contributory plans allow employees to share in the premium costs, meaning participation isn't mandatory, and employees can choose not to enroll. Options to opt-out or have voluntary participation do not apply in the context of a noncontributory plan, as these would lessen the level of coverage and increase the financial burden on the employer. Therefore, requiring 100% employee participation is a foundational principle of noncontributory group plans.