[单项选择]Nowadays, no document is safe any more. Counterfeiting. once the domain of skilled deceivers that used expensive engraving and printing equipment, has gone mainstream since the price of desktop publishing systems has dropped. In ancient times, counterfeiting was a hanging offence. Today, desktop counterfeiters have little reason to worry about prison, because the systems they use are ubiquitous (普遍存在的) and there is no means of tracing forged documents to the machine that produced them. This, however, may soon change thanks to technology development by George Chiu, an anti-counterfeiting engineer.
His approach is based on detecting imperfections in the print quality of documents. Old-school scientists were able to trace documents to particular typewriters based on quirks (构槽) of the individual keys. He employs a similar approach, exploiting the fact that the rotating (转动) drums and mirrors inside a printer are imperfect pieces of engineering which leave unique patterns of banding
A. it is economically affordable and technically practical
B. it strengthens the collaboration between printing companies
C. it makes printers cheaper and hard to be taken around
D. it is able to identify even the most specialized criminals