Your new colleague is working on a large outerwear campaign and wants to use structured data files (SDFs) to update some details. They ask you to check why they’re getting an error message when they upload everything to Display & Video 360. Which setting is causing this error?

They set up an SDF with rows for both editing and removing line items.
They set up an SDF for modifying inventory sources.
They set up an SDF with 100 line items in a single file.
They set up a single SDF with both line item and insertion order rows.