In ArcGIS 10, what can you do with multiple vertices simultaneously?

In ArcGIS 10, the capability to work with multiple vertices simultaneously allows users to enhance efficiency in editing spatial data. The correct choice reflects that you can both delete and move multiple vertices at the same time. This feature is particularly useful when modifying lines or polygons, as it streamlines the process of adjusting geometries. For example, if you have a linear feature representing a road and need to adjust several points along its path, being able to select and move these vertices in bulk can save significant time compared to adjusting them individually.

The other options suggest limitations that do not align with the functionality available in ArcGIS 10. Being able to add vertices only one at a time or moving them together but not independently would hinder the editing process, making it less flexible and practical for users who need to manage complex spatial edits efficiently. Enabling the deletion of multiple vertices is crucial for refining datasets where certain points may no longer be necessary, ensuring that users have the robust tools they need for comprehensive GIS editing tasks.