Which of the following correctly defines the backup generator's role during a power outage?

The backup generator's primary function during a power outage is to provide a temporary power supply that allows essential operations to continue. This ensures that critical systems, such as lighting, refrigeration, medical equipment, or communication devices, remain operational until the main power source is restored. Backup generators are typically designed to start automatically or be engaged manually, depending on the system configuration, to quickly restore power when a disruption occurs.

The other options present scenarios that don't accurately describe the typical function of a backup generator. For instance, while some systems may use solar power, being switched to solar power instantly is not a function of a backup generator. Additionally, a generator often does not require continuous manual intervention; many are equipped with automatic transfer switches that manage power restoration efficiently. Lastly, backup generators are not intended as permanent power sources; instead, they are temporary solutions designed to support power needs during outages.