What is a state store in Kafka Streams, and how does a changelog topic support fault tolerance?

What is a state store in Kafka Streams, and how does a changelog topic support fault tolerance?

• A. State store caches only topic offsets
• B. State store holds local computed state; changelog topic records changes for fault tolerance and restores state after restart.
• C. State store stores only configuration
• D. State store is a persistent database

Answer: (B)