What is the bar across the bottom of any ES window?

 According to the Splunk Enterprise Security documentation, the bar across the bottom of any ES window is called the Investigation Bar. The Investigation Bar is a tool that helps you create and manage investigations in ES. An investigation is a collection of related notable events, comments, and artifacts that document a security incident or a threat hunting activity. You can use the Investigation Bar to do the following tasks:

Create a new investigation or open an existing one.

Add notable events, comments, and artifacts to an investigation.

Assign an owner and a status to an investigation.

Share an investigation with other users or roles.

Export an investigation as a PDF report.

The Investigation Bar also provides a link to the Investigation Workbench, which is a dashboard that shows a timeline and a summary of an investigation. Therefore, the correct answer is B. The Investigation Bar. References = Use the Investigation Bar.