In Kafka, if the current leader broker fails and there are in-sync replicas (ISRs), what happens to the partition?

• A. The remaining follower steps in as leader immediately without considering log replication status.
• B. Writes are paused until an external coordinator assigns a new leader from a subset of brokers.
• C. A new leader is elected from the in-sync replicas; if no in-sync replicas are available, the partition becomes unavailable for writes.
• D. The cluster uses a global quorum to elect a leader across all brokers.

Answer: (C)