During the 2008 u. s. presidential campaign, hackers were able to gain access to an email account of vice presidential candidate, sarah palin. their attack is said to have involved tricking the mail system to reset governor palin password, claiming they were really palin and had forgotten this password. the system asked the hackers a number of personal questions regarding palin’s identity, including her birthday, zip code, and a personal security question -- "where did you meet your spouse? " - all of which the hackers were able to answer using data available on the internet. what kind of attack on this example of?