Which of the following is a Big Data tool employed for real-time stream…

Apache Flink is a leading framework specifically designed for real-time stream processing within the Big Data ecosystem. Unlike Hadoop, which focuses on batch processing and storage, Flink provides low-latency streaming capabilities. Splunk is primarily used for log analysis, and ERDPlus is a database design tool, neither of which are core stream processing engines. Therefore, Apache Flink is the correct choice for real-time stream processing.