What update source is used by Tenable to provide new dashboards and updates?

The correct answer is the source associated with updates for Tenable products and features, specifically Tenable Security Center. This particular source is dedicated to providing the latest features, dashboards, and updates specifically for the Tenable products, ensuring users have access to the most current functionalities and enhancements. Utilizing this source allows users to stay informed of important updates that can then be integrated into their security practices.

The other sources mentioned serve different purposes; for instance, downloads.nessus.org is primarily focused on the Nessus software itself, while tenable.io is a platform for cloud-based vulnerability management. www.tenable.com serves as a general site for information about Tenable's offerings, but it does not primarily act as the direct update source for dashboards or system updates. Therefore, the specific update source for dashboards and updates is crucial for maintaining an effective and secure environment with Tenable products.