Which command resets a consumer group's offsets to the earliest offset for a specific topic?

• A. $bin/kafka-consumer-groups.sh --bootstrap-server localhost:9092 --describe -group my-first-consumer-group --reset-offsets --to-earliest --execute --topic my-first-topic
• B. bin/kafka-consumer-groups --bootstrap-server localhost:9092 --group my-first-consumer-group --reset-offsets --shift-by 2 --execute --topic my-first_topic
• C. bin/kafka-consumer-groups --bootstrap-server localhost:9092 --group my-first-consumer-group --reset-offsets --shift-by -2 --execute --topic my-first_topic
• D. bin/kafka-consumer-groups --bootstrap-server localhost:9092 --group my-first-consumer-group --reset-offsets --to-latest --execute --topic my-first_topic

Answer: (A)

Resetting a consumer group to start from the very beginning for a topic is done by using the reset-offsets command with the to-earliest option and then applying the change with execute. This combination tells Kafka to move every partition of that topic for the specified consumer group back to the earliest available offset, so processing would start from the first message again. The include of describe is optional but helpful, as it shows the current offsets before you apply the reset. The key is to use to-earliest together with reset-offsets and execute for the targeted group and topic. Other approaches shown move offsets by a fixed amount or push them to the latest, which would not achieve starting from the earliest message, so they’re not appropriate for this goal.