The accounting department has requested a printer with a duplexing assembly. They most likely want to add which of the following features?

Color printing on card stock requires a color-capable print engine and appropriate media weight settings in the paper tray, not a duplexing assembly.

A duplexing assembly (duplex unit) contains rollers and a paper path that flips the page after the first side is printed, feeding it back through the print engine to produce output on both sides automatically; this is the sole purpose of the component and precisely what the accounting department is requesting.

Printing on envelopes requires a dedicated envelope feeder accessory and correct media size/type settings, not a duplexing assembly.

Printing on specialized paper requires compatible media settings and sometimes a special input tray, which is unrelated to the duplexing assembly.