Which major cybersecurity breach in 2020 compromised multiple U.S. federal agencies by exploiting SolarWinds' Orion software?

Test your knowledge about one of the most significant cybersecurity incidents affecting the U.S. government in recent history. This breach had major implications for national security and prompted significant changes in federal cybersecurity policies and practices. See if you can identify which cyber attack compromised numerous federal agencies and major corporations through a sophisticated supply chain attack.

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The SolarWinds Orion breach (also known as SUNBURST or Solorigate)
The Colonial Pipeline ransomware attack
The Office of Personnel Management (OPM) data breach
The Microsoft Exchange Server vulnerabilities exploitation (HAFNIUM)