Correct answer
They are complementary systems; one cannot replace the other.
They are complementary systems. The seat belt restrains the occupant and helps reduce injury risk; the airbag provides additional protection in the impacts for which it is designed. It does not replace the belt or necessarily deploy in every crash. Both have limitations and do not guarantee preventing every injury.
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They are complementary systems; one cannot replace the other.
They are incompatible systems; the airbag must be disconnected when the seatbelt is worn.
The airbag is a safety system that replaces the seatbelt.
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