GMAT Critical Reasoning (CR) | Secret passwords are often used to control access to computers

Secret passwords are often used to control access to computers. When employees select their own password , they frequently choose such easily guessed password as their initials or birthdates. To improve security, employers should assign randomly generated passwords to employees rather than allowing employees to make up their own.

Which of the following, if true, most seriously undermines the conclusion drawn above?

1)If passwords are generated randomly, it is theoretically possible that employees
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