Which requirement must qualified plans fulfill regarding communication?

Qualified plans are required to communicate pertinent details to all interested employees to ensure transparency and proper understanding of their benefits and rights under the plan. This requirement emphasizes the importance of clear communication in the management of retirement plans, allowing employees to make informed decisions regarding their participation and investments. Effective communication can include providing information about plan features, eligibility criteria, benefits, and administrative processes. By fulfilling this requirement, qualified plans help foster employee engagement and awareness, which are crucial for effective retirement planning and financial literacy.

The other options, while relevant to aspects of qualified plans, do not address the specific requirement for communication with employees. Having a qualified investment manager, obtaining an IRS determination letter, or being covered under a prototype plan document are all important elements for the administration and compliance of retirement plans, but they do not directly relate to the obligation of communicating key information to employees.