What must be ensured about the beaded handles of the LPU-21 life preserver?

The correct emphasis on ensuring that the beaded handles of the LPU-21 life preserver need to be securely fastened and accessible is rooted in safety protocols and efficient life-saving measures. This design feature is crucial because, in an emergency situation, quick access to a life preserver can be the difference between life and death.

When the handles are securely fastened and easily accessible, it allows users to grab the life preserver quickly when needed, facilitating an immediate response. An accessible life preserver increases the likelihood that individuals are able to utilize it effectively during an emergency. Thus, ensuring the handles are in good condition and readily available aligns with best practices in personal flotation device management.

While the other options mention important aspects of safety and maintenance, they do not directly address the critical point of accessibility and readiness which is paramount in emergencies where life preservers are required.