What Is the Most Accurate Statement About Employers Using Google

What is the most accurate statement about employers using Google and social networking sites to screen job candidates?

A) Employers rarely use Google or social networking sites to screen job candidates because these tools are not effective.
B) Employers use Google and social networking sites exclusively to weed out candidates they don't want to hire.
C) A top reason cited for not hiring an applicant after an online search is that the candidate talked negatively about current or previous employers, colleagues, or clients.
D) It is illegal for employers to use Google and social networking sites to screen job candidates.