What type of classified material can be hand-carried by representatives according to the regulations?

The correct answer emphasizes that representatives are authorized to hand-carry only classified materials that are designated as secret and above. This restriction is primarily due to security protocols that govern the handling and transportation of classified information, which differ based on the sensitivity of the data.

Secret and above materials, such as top secret documents, require stricter controls to prevent unauthorized access and potential compromise. Hand-carrying these types of classified materials allows for a higher level of security throughout the transportation process, reducing the risk associated with less secure forms of transmission.

On the other hand, lower classifications, such as confidential materials, typically have different handling requirements and are often not permitted to be transported in that manner, warranting a more formalized and secure delivery process. Additionally, the option that refers to weight restrictions is not directly related to the classification level of the materials but is more about logistical considerations rather than security protocols. Therefore, only the choice reflecting the need for hand-carrying secret and above materials aligns with the established regulations governing the movement of sensitive information.