Which three properties comprise the CAP theorem?

• A. Consistency, Availability, Latency
• B. Consistency, Availability, Partition tolerance
• C. Availability, Security, Partition tolerance
• D. Availability, Partition tolerance, Consistency

Answer: (B)

The idea being tested is that in a distributed system you have to trade off among three properties:Consistency, Availability, and Partition tolerance. Consistency means every read sees the most recent write, so the system appears as a single up-to-date copy. Availability means every request gets a (successful) response, even if some parts of the data might be stale. Partition tolerance means the system keeps operating even if network failures separate nodes into partitions. The CAP theorem says you can have at most two of these three in the presence of partitions, so you must choose which two to prioritize in a given scenario. Latency and security aren’t part of CAP, which is why they aren’t part of the correct trio. Therefore, the three properties that comprise CAP are Consistency, Availability, and Partition tolerance.