The general availability of high-quality electronic scanners and color printers for computers has made the counterfeiting of checks much easier. In order to deter such counterfeiting, several banks plan to issue to their corporate customers checks that contain dots too small to be accurately duplicated by any electronic scanner currently available; when such checks are scanned and printed, the dots seem to blend together in such a way that the word "VOID" appears on the check.
A questionable assumption of the plan is that:
c) The smallest dots on the proposed checks cannot be distinguished visually except under strong magnification.
e) The size of the smallest dots that generally available electronic scanners are able to reproduce accurately will not decrease significantly in the near future.
Can anybody explain this question?
When I face this problem, I have strong senses that one of C and E will be the correct answer choice. But when I reasoning by negate technique, the choice C and E will be:
c) The smallest dots on the proposed checks can be distinguished visually (except under strong magnification.) => I do not remember what magnification means, but I can presume that this word's meaning unrelated to the scanner system and that why I eliminate this answer choice.
e) The size of the smallest dots that generally available electronic scanners are able to reproduce accurately will decrease significantly in the near future. => here is the correct answer choice. If the size of dots become smaller, the scanner will not realize (as well as reproduce) these dots whether these checks have these dots or not. So, the plan of using dots to prevent counterfeiting will be not efficient.
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