A marketer created a line item in Display & Video 360 for a mobile web campaign accidentally targeted mobile in-app. To correct this, the marketer removed the mobile in-app targeting at the insertion order level. Why would the campaign continue to target mobile in-app?

Modifying targeting once line items are assigned to a campaign can’t be done.
Modifying insertion order targeting at the line item level can’t be done.
Modifying targeting for mobile in-app inventory can’t be done.
Modifying existing line item targeting at the insertion order level can’t be done.