题目选项分析

Many computer databases impose formatting requirements, such as minimum numbers of capital letters or numerals, on users' passwords in an attempt to enhance security; ironically, these measures often make the passwords easier to guess, as users are more likely to select the simplest possible password that conforms to all the rules.

Many computer databases impose formatting requirements, such as minimum numbers of capital letters or numerals, on users' passwords in an attempt to enhance security—ironic measures that often cause passwords to be easier to guess because they are more likely to select the simplest possible password that conforms to all the rules.