What means below best ensures the security of classified information being transported?

The best means to ensure the security of classified information being transported is to use secure transport methods, such as armored vehicles or secure couriers trained in handling sensitive materials. Additionally, employing encryption for electronic data and using sealed, tamper-proof containers can safeguard against unauthorized access. Implementing strict access controls and tracking systems further enhances security during transit. Regular training and adherence to established protocols are also crucial for maintaining the integrity of classified information.