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Sub 505 (Easy)|   Conclusion|                                                
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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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The Correct Answer: C
Nobody can gain access to a computer equipped with the software solely by virtue of skill at forging signatures.

This follows directly from the passage. The passage tells us that even the best forger cannot duplicate all the characteristics the software analyzes. So forging skill alone is never enough to get access. Choice C is simply restating this in precise terms.


The Trap to Watch:
Choice E is a common trap. It says authorized users are often denied access. This sounds plausible but the passage never says this. A possibility is not an inference. The passage must confirm it for it to qualify as a conclusion.

Choices A, B, and D introduce information the passage never provides: time taken, future use in banks, and development history respectively. None of these can be inferred.

Key Takeaway for Inference questions: The correct answer must be definitely true based on what the passage states, not merely possible or reasonable.


Check this video solution for detailed solution with error analysis:


Just getting started with Inference? Build your foundations the right way. Check out more beginner-friendly questions in our Inference playlist before moving to harder questions.
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