Which of the following world events was shaped by the digital technology described in the passage?

The Arab Spring of 2010 gained momentum with social media posts and culminated with the deposing of four dictators in the Middle East.
Casualties from the 2004 tsunami in South Asia were minimalized due to the automated early-warning systems.
The global economy contracted in 2008 following the failure of computer networks to adequately handle the trading of mortgage-backed securities.
South Sudan was established as a sovereign state in 2011 after an extensive online campaign to break away from the country of Sudan.