The tape timer used in this experiment marks the paper tape with dots at fixed time intervals. How does it do

It works like a taser. It uses a spark generator to put burn marks on the paper.

It works like a typewriter. It uses an oscillating pin and a carbon paper to put marks on the paper tape.

It works like an inkjet printer. It uses ink to mark the paper.

It works like a laser printer. It uses a laser and a toner to mark the paper.