When a member joins or leaves a Kafka consumer group, what happens to the partition assignments?

When a member joins or leaves a Kafka consumer group, what happens to the partition assignments?

• A. The group coordinator rebalances, and partitions are reassigned to the remaining members.
• B. Partitions are fixed and never rebalanced.
• C. The broker assigns partitions randomly without coordination.
• D. Offsets are recalculated automatically on join or leave.

Answer: (D)