You’re training a new colleague to set up non-YouTube Connected TV campaigns. They need to modify a certain campaign setting so the campaign can run properly, but they can’t remember which one it is. Which campaign setting must they modify so the campaign can run properly?

The campaign is set up to limit the inventory to a particular device.
The campaign is set up to run ads that are 15, 30, and 60 seconds long.
The campaign is set up to add brand safety targeting to all line items.
The campaign is set up to purchase CTV app inventory both through deals and open auction.