Which of the following is NOT a Kafka producer property?

• A. bootstrap.servers
• B. value.serializer
• C. group.id
• D. key.serializer

Answer: (C)

In Kafka, producer configuration focuses on how messages are produced and sent to the brokers. The property group.id is not part of producer configuration; it is used by consumers to identify their consumer group, which enables coordinated consumption and offset tracking.

Bootstrap servers is a producer property that tells the client where the Kafka cluster lives so it can establish a connection. Key and value serializers specify how the keys and values are converted into bytes for transmission, which is essential for the producer to create messages in the correct format.

Since group.id is tied to consumer group management rather than producing messages, it is not a Kafka producer property.