Final answer:
B) Ambari.The tool commonly used to monitor and manage data security across a Hadoop platform is Ambari. Ambari provides a web-based user interface for managing, monitoring, and securing Hadoop clusters.
Step-by-step explanation:
To monitor and manage data security across a Hadoop platform, the tool that is commonly used is Ambari. Ambari provides a web-based user interface for managing, monitoring, and securing Hadoop clusters. It allows you to set up authentication and authorization for users, control access to resources, and monitor the health and status of the Hadoop ecosystem.
For example, with Ambari, you can configure Kerberos authentication to ensure secure access to your Hadoop platform. You can also set up alerts and notifications for monitoring potential security breaches or abnormal behavior.
Other tools mentioned in the question, such as Sqoop, Flume, and Pig, are used for different purposes in the Hadoop ecosystem. Sqoop is a tool for importing and exporting data between Hadoop and relational databases, Flume is used for collecting and aggregating large amounts of streaming data, and Pig is a high-level scripting language for analyzing large datasets.