Which of the following is not a valid SecurityCenter report type?

The correct answer is that ARF is not a valid SecurityCenter report type.

SecurityCenter, which is part of Tenable's suite of security products, offers various ways to present information and data gathered during security assessments. Common report types include CSV (Comma-Separated Values) for easy data manipulation in spreadsheets, HTML for web-based representations of report findings, and RTF (Rich Text Format) for compatibility with word processing applications.

ARF (Asset Reporting Format) is not typically listed as a type of report that SecurityCenter generates or supports. Thus, identifying it as the non-valid type aligns with what is understood about reporting formats in SecurityCenter. Understanding the recognized formats helps users effectively choose the best one for their reporting needs, ensuring compatibility and functionality for analysis and presentation.