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There are different safety fastening systems for protective helmets. However, it can be said that:

AThe safest and lightest system is the so-called "double D-ring" fastener.Correct
BThe safest and lightest system is the so-called quick-release fastener, consisting of two interlocking parts.
CThe safest and lightest system is the so-called quick-release fastener with special Velcro applications.
Explanation
The double D-ring fastening system is widely recognized as the safest and lightest for protective helmets. Because it does not have complex mechanical components, this system does not run the risk of failing due to wear or breakage, always ensuring a precise and highly resistant fit in the event of an impact. Quick-release fasteners or Velcro-based fasteners are less secure, as they are subject to mechanical wear, accumulation of dirt, or accidental opening under extreme forces, not offering the same reliability as the double D-ring system.
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