While working with your jewelry designer client, you learn that they created a line item in their Display & Video 360 web campaign that accidentally targeted mobile in-app. After removing that mobile in-app targeting at the insertion level, the campaign is still targeting mobile in-app. Why could that be?

Because you can’t modify existing line item targeting at the insertion order level.
Because you can’t modify targeting for mobile in-app inventory at the line item level.
Because you can’t modify insertion order targeting at the line item level.
Because you can’t modify targeting once the campaign has line items assigned.

The correct answer is:

Because you can’t modify existing line item targeting at the insertion order level.