A for apple, B for ball, C for “CAP theorem”
In the world of databases today, consistency is one of the most misunderstood concepts. It is also one of the big reasons NoSQL databases are difficult to reason about.
The CAP theorem states that “in the presence of a network partition, one has to choose between consistency and availability”. In order to provide higher write availability, some NoSQL databases implement a weaker form of consistency called eventual consistency.