【单选题】

No document is safe any more. Faking once the domain of skilled deceivers that used expensive engraving (雕刻) and printing equipment, has gone mainstream since the price of desktop-publishing systems has droppeD、In ancient times, faking was a hanging offence. Today, desktop counterfeiters have little reason to worry about prison, because the systems they use are universal 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 GeorgeChiu, an anti-faking engineer.

His approach is based on detecting imperfections in the print quality of documents. Old-school court scientists were able to trace documents to particular typewriters based on quirks (沟槽) of the individual keys. He employs a similar approach, exploiting the fact that the rotating drums and mirrors inside a printer are imperfect pieces of engineering which leave unique patterns of banding in their products.
Although these patterns are invisible to the naked eye, they can be detected and analyzed by computer programs, and it is these thatDr.Chiu has spent the past year devising. So far, he cannot trace individual printers, but he can tell pretty reliably which make and model of printer was used to create a document.
That, however, is only the beginning. While it remains to be seen whether it will be possible to trace a counterfeit document back to its guilty creator on the basis of manufacturing imperfections,Dr.Chiu is now working out ways to make those imperfections deliberate. He wants to modify the printing process so that unique, invisible signatures can be incorporated into each machine produced which would make nay document traceable.
Ironically, it was after years of collaborating with printing companies to reduce banding and thus increase the quality of prints, that he came up with the idea of introducing artificial banding that could encode identification information into a document. Using the banding patterns of printers to secure documents would be both cheap to implement and hard, if not impossible, for those without specialist knowledge and hardware to hide out.
Not surprising, theAmerican Secret Service is monitoring the progress of this research very closely, and is providing guidelines to helpDr.Chiu to travel in what the service thinks is the right direction, which is fine for catching criminals.But how the legal users of printers will react toBigBrother being able to track any document back to his source remains to be seen.
By saying "no document is safe any more", the author probably means ______.A．affordable printers make it possible for anyone to forge documents
B．theAmerican Secret Service will be able to trace any document
C．every printed document will be secretly marked out through high-tech
D．counterfeiters have more advanced technology to use