Confluent Certified Developer for Apache Kafka

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Question 1 of 1
Your Kafka cluster has five brokers. The topic t1 on the cluster has:
- Two partitions
- Replication.factor = 4
- min.insync.replicas = 3
You need strong durability guarantees for messages written to topic t1.
You configure a producer 'acks=all' and all the replicas for t1 are in-sync.
How many brokers need to acknowledge a message before it is considered committed?
    Correct Answer: C