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ThatDudeKnows
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A, B, D are easy kills.
Lets take C. Suppose you're great at forging signatures and come to know of a bank where your great great grandpa kept $500 mn dollar and now you can claim it provided you reproduce his signature. Not very difficult! You take a look at his signature, pick up a blank piece of paper, practice few times and voila! Now you can reproduce his signature in an almost identical way. You go to bank, the teller asks you to sign on the iPad which has this particular software installed, you confidently sign and the software gives error beeps, not recognizing the signature!!! That's what happened just now. The software also takes into account how much pressure one applies when signing and the speed of signing. Guess its not only about that particular style/shape/form in which one signs, there's more to what meets the eye. This is exactly what C says that if someone just looks at the signature of somebody else, even the best of the forgers will not know how much pressure was applied, what was the speed while transitioning from one alphabet within signature to another. And software detects such parameters, making it impossible to crack by just putting a signature.
E - This could be true. But we don't know 2 things- whether the software is so super sensitive that it cannot account for slight natural variations to one's own signature and if few people can always have variations in pen pressure and signing speed thus making it difficult for software to recognize them. We are not sure about these scenarios so better stay away from this option.
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Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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