This answer should be false
Because in photographs it can be zoom out and not really seen.
1.) The Stylophone was accidentally invented in 1968 in Britain and production of the original model ran right into the early 80's
2.) Rolf Harris put the Stylophone on the map with his cheesy advertising and even gave handy techniques and lessons on television
The answer is C. Ink is added to the engraved grooves.
