Which is a legal requirement for carrying a restricted firearm in Canada?

Possessing a valid PAL (Possession and Acquisition License) and registration is a fundamental legal requirement for carrying a restricted firearm in Canada. The PAL demonstrates that the individual has completed the necessary training and safety courses, which ensures they understand how to handle firearms responsibly and safely. Additionally, registration of restricted firearms is a legal requirement, meaning that these firearms must be recorded in a federal database, helping to ensure accountability and traceability. This requirement is crucial for maintaining public safety and ensuring that individuals who possess these firearms are legally authorized to do so.

The other options do not meet the legal requirements associated with carrying a restricted firearm. Accompanying a friend may not provide legal standing, specific weather conditions do not dictate legality, and keeping the firearm unloaded at all times does not address the necessity of having a valid legal authorization to possess and carry the firearm in the first place. Therefore, possessing a valid PAL and registration is the only accurate legal requirement among the choices provided.