Which command describes a consumer group named 'my-first-consumer-group'?

• A. bin/kafka-consumer-groups.sh --bootstrap-server localhost:9092 --list
• B. bin/kafka-consumer-groups.sh --bootstrap-server localhost:9092 --describe -group my-first-consumer-group
• C. bin/kafka-consumer-groups.sh --bootstrap-server localhost:9092 --describe --group my-first-consumer-group
• D. bin/kafka-consumer-groups.sh --zookeeper localhost:2181 --describe -group my-first-consumer-group

Answer: (B)

To inspect a consumer group's state, you run the Kafka consumer groups tool with the describe action and specify which group you want to examine, while pointing to your cluster with the bootstrap-server option. This approach returns details like the group’s partitions, current offsets, and lag. The command that matches this intent connects to localhost:9092, performs a description, and targets the group named my-first-consumer-group. Other options don’t fit as well: one would list all groups rather than describe a specific one, another relies on Zookeeper (which is outdated for modern Kafka setups), and another uses a flag form that isn’t the standard way to pass the group name, making it unreliable for describing the group in typical environments.