Which massive data breach led to the creation of the U.S. Government's Cybersecurity Sprint initiative in 2015?

In the world of politics and government, cybersecurity has become a critical national concern. Major cybersecurity incidents affecting government agencies have shaped policies, prompted new legislation, and changed how governments protect sensitive information. Test your knowledge about a landmark cybersecurity event that fundamentally altered how the U.S. government approaches digital security.

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Office of Personnel Management (OPM) breach that exposed 21.5 million federal employees' personal data
The State Department email system hack that compromised diplomatic communications
The Healthcare.gov website vulnerability that exposed applicants' medical information
The IRS data breach that allowed hackers to file fraudulent tax returns