Which property is used to specify where to connect for a Kafka producer?

• A. client.id
• B. acks
• C. group.id
• D. bootstrap.servers

Answer: (D)

The key idea is how a producer finds the Kafka cluster to connect to. bootstrap.servers provides one or more broker addresses (host:port) that the producer uses to establish the initial connection and retrieve the cluster metadata. With this metadata, the producer learns about all brokers, partition leaders, and how to route messages. You can list several brokers for fault tolerance, and the producer will switch to others if one goes down. After the initial metadata is obtained, the producer doesn’t need to keep connecting to the same initial broker—it's about starting point and discovery.

The other settings don’t specify where to connect: client.id is just an identifier used in logs and metrics, acks controls how many broker acknowledgments are required for a write, and group.id is used by consumers to form consumer groups, not producers.