Final answer:
Both technicians are correct since the removal of an alternator can be from either the top or the bottom, depending on the vehicle design and engine layout.
Step-by-step explanation:
Both Technician A and Technician B are correct; depending on the vehicle design, the alternator may be removed from either the top or the bottom of the engine bay. Vehicle manufacturers design their vehicles in unique ways, and access to the alternator will vary accordingly. In some cases, removing the alternator from the top might be easier due to more clearance or accessibility, whereas, in other instances, the alternator may need to be removed from underneath the vehicle because of space constraints or design considerations surrounding engine components.