What does CASS stand for?

The correct answer is that CASS stands for Cockpit Access Security System. This term refers specifically to the systems and procedures in place to secure access to the cockpit of an aircraft, ensuring that only authorized personnel can enter. The implementation of CASS is vital for maintaining air safety and protecting the crew and passengers on board.

While the other options may seem plausible, they do not accurately capture the specific focus of the CASS designation. The term specifically emphasizes "cockpit access" rather than cabin access or general safety standards, highlighting the system’s dedicated role in security measures related to the cockpit area, which is critical in preventing unauthorized access during a flight.