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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" fastening.Correct
BThe safest and lightest system is the so-called quick-release fastening, consisting of two interlocking parts.
CThe safest and lightest system is the so-called quick-release fastening by special velcro applications.
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