What condition will cause the aircraft to switch to emergency electrical configuration?

The correct answer is associated with the specific scenario when both AC buses 1 and 2 lose power while the aircraft is above 100 knots. In this situation, the aircraft automatically switches to an emergency electrical configuration to maintain essential systems and instruments vital for safe operation during flight. This ensures that critical components remain powered even in the absence of normal electrical sources, allowing the crew to handle the emergency effectively.

In contrast, the supply of power from batteries to AC buses 1 and 2, the operation of the emergency generator, and voltage discrepancies between the batteries do not directly trigger the switch to emergency electrical configuration in the same manner. Each of these scenarios involve different conditions of power supply, but they do not inherently reflect a total loss of primary power to the AC buses, which is the critical trigger for activating emergency protocols.