A feature class in Coordinate System A is added to a data frame in ArcMap using Coordinate System B. How does ArcMap display the features accurately?

ArcMap utilizes a method known as "on-the-fly" projection to accurately display features from a feature class in one coordinate system within a data frame that uses a different coordinate system. When a feature class with Coordinate System A is added to a data frame set to Coordinate System B, ArcMap dynamically transforms the data to match the display coordinate system. This allows users to view and work with datasets from various coordinate systems simultaneously without altering the original data.

The "on-the-fly" projection process means that the features are visually projected for display purposes only and the original data remains unchanged within its native coordinate system. This facilitates the integration of diverse spatial data and enhances the workflow in GIS projects.

In contrast, the other options involve either a permanent change to the data's coordinate system, which is not how ArcMap functions with on-the-fly projection, or require user intervention before the data can be displayed, which would not be necessary with the dynamic capabilities of ArcMap.