Which of the following would MOST likely be connected to a computer to provide electricity in case of a blackout?

A UPS (Uninterruptible Power Supply) contains an internal battery that activates instantly and without interruption when utility power is lost, supplying clean AC power to connected equipment. It provides enough runtime for continued operation or a graceful shutdown during a blackout. It is the only device in these choices that is permanently connected and delivers immediate power failover.

A surge suppressor protects against voltage spikes and electrical surges but contains no battery and provides zero backup power when utility power is completely lost.

A portable generator can supply power during extended outages but has a startup delay, requires manual intervention, and is not directly connected for seamless failover.

A power inverter converts DC to AC power but is not a standalone backup solution - it requires a separate battery source and is not designed as a direct, plug-in computer backup device.