Answer: a. Unauthorized individuals can use data mining and other techniques to guess a user’s password.
Explanation:
In a case whereby a weak password is used, devices and information can be susceptible to unauthorized access as the unauthorized individuals can use data mining and every other methods in order to guess the user's password.
Data mining has to do with finding patterns and anomalies, within large data sets in order to forecast outcomes. Once, the password of the user has been gotten, this can be used for either fraudulent activities or every other thing that the hacker intends to do.