Which of the following nations hacked the personal data of 21.5 million U.S. government employees?
In 2015, cyber specialists associated with the government of China hacked the Obama administration's Office of Personnel Management (OPM) and obtained the background investigation records of 21.5 million U.S. government employees. Per OPM, it is "highly likely" this hack exposed virtually all federal employees, including those with "Top Secret level clearance." The stolen information includes their Social Security numbers, financial histories, fingerprints, and "information about immediate family and personal and business acquaintances." The Obama administration did not take any public recourse against China.