Which statement correctly describes exactly-once semantics and how to enable it in Kafka?

Which statement correctly describes exactly-once semantics and how to enable it in Kafka?

• A. At-least-once semantics may duplicate; transactions alone enable EOS.
• B. At-most-once semantics may lose data; read_committed alone enables EOS.
• C. Exactly-once semantics ensures no duplicates; isolation.level=read_committed and transactions enable EOS.
• D. EOS can be achieved without transactions.

Answer: (C)