An administrator recommends using a tower server in a small remote office. Which of the following should be added to the server to ensure continuous server operation?

A surge protector only clamps voltage spikes; it does not provide backup power during an outage and cannot keep a server running if the utility power fails.

A PDU distributes existing power to multiple devices within a rack or room but contains no battery and provides no power during an outage.

A UPS contains an internal battery that instantly supplies power when the utility feed fails, preventing unexpected shutdowns that could corrupt data or interrupt services. It also conditions the incoming power to protect against fluctuations, sags, and surges, making it the only device among the choices that directly ensures continuous server operation rather than merely protecting against one class of electrical event.

An anti-static ground strap protects hardware from electrostatic discharge during handling and has no role in maintaining continuous electrical power to an operating server.