What happens when broker.rack configuration is provided in broker configuration in Kafka cluster?

What happens when broker.rack configuration is provided in broker configuration in Kafka cluster?
A . You can use the same broker.id as long as they have different broker.rack configuration
B . Replicas for a partition are placed in the same rack
C . Replicas for a partition are spread across different racks
D . Each rack contains all the topics and partitions, effectively making Kafka highly available

Answer: C

Explanation:

Partitions for newly created topics are assigned in a rack alternating manner, this is the only change broker.rack does