Which event occurred in October 1962, sparking the Cuban Missile Crisis?

In October 1962, a U.S. U-2 spy plane photographed Soviet missile installations being built in Cuba. The discovery alerted President Kennedy to the missiles and sparked the Cuban Missile Crisis, so the correct choice is “A U.S. spy plane photographed a Soviet missile base on Cuba.” The other events happened earlier: the Vienna Summit was in 1961, the Bay of Pigs invasion was in 1961, and construction of the Berlin Wall began in 1961.

AI-written and checked against the verified answer.