Which of the following printers is required when carbon paper is used?

An inkjet printer sprays microscopic droplets of liquid ink onto the top sheet only - it applies no physical pressure and cannot transfer an impression through carbon paper layers.

A thermal printer uses heat to activate a chemically treated paper surface - it applies no physical striking force and cannot activate carbon paper.

A laser printer uses a toner-based electrophotographic process with a fuser applying heat and pressure to the top sheet only - it cannot transfer an imprint through multiple carbon layers.

Impact printers (such as dot-matrix printers) use a print head that physically strikes an inked ribbon against the paper with mechanical force. This impact pressure transfers ink and creates an impression through all underlying carbon paper copies simultaneously, making them the only printer type compatible with multi-part carbon forms.