Answer :
Final answer:
Both Technician A and Technician B are correct; some 4WD hubs require manual operation while others have automatic lock and unlock functionality.
Explanation:
Both Technician A and Technician B are correct. Technician A says that some front 4WD hubs must be manually locked and unlocked, which applies to older or more basic four-wheel-drive systems where the driver must physically engage the hubs at the wheels. On the other hand, Technician B mentions that some front 4WD hubs can be automatically locked and unlocked, which refers to modern vehicles equipped with automatic hub locks that engage and disengage either when the four-wheel-drive system is activated via a switch or when the vehicle's computer senses that additional traction is needed.
