For Question 1, wouldn't the conclusion be "If such a business introduced minor variations into its operating system software, unauthorized access to all the computers at the same time could be virtually eliminated."

The reason I say so is because, isn't this the point the author of question 1 is trying to make and is very well supported by other statements.

The conclusion at the last sentence, just seems very vague, although it is supported, does not tell us readers what SPECIFIC point he is making other than "...it is advisable for businesses to implement SUCH variations." The vagueness and ambiguity is concerning me. Please advise.