What are some types of Supplemental Restraint Systems (SRS)?

The correct answer identifies a comprehensive range of Supplemental Restraint Systems (SRS) used in modern vehicles. These systems are designed to enhance passenger safety during a crash by providing additional restraint alongside standard seatbelts.

Seatbelt pretension systems play a critical role by retracting the seatbelt during a collision, which helps to minimize the forward movement of the occupant, thereby reducing the risk of injury. Airbags are also a vital component of SRS, deploying in various types of crashes to cushion and protect occupants from impact forces. Additionally, rollover protection systems are included as they help prevent ejection during rollover incidents, offering further protection in specific collision scenarios.

This choice reflects a more complete understanding of the range of technologies that constitute SRS, making it the best answer. The other options lack the versatility and specification of the systems involved, which is why they do not provide an accurate description of the types of SRS.