[Ans] Article V of the NATO charter, which states that all countries of the alliance will assist a member state if it’s attacked, was first invoked when?

Article V of the NATO charter, which states that all countries of the alliance will assist a member state if it’s attacked, was first invoked when?

Berlin Blockade
Korean War
Vietnam War
Kosovo Conflict
September 11 Attacks

The correct answer is September 11 Attacks