If you’d like your ads to show on certain sites across the Internet, you can add these websites as:
The correct answer would be placements. This is because the word placement, in terms of the Display Network, could mean a variety of things. For example, it could refer to a specific individual ad that is shown on a single video, page, mobile phone app, and so on. It could also refer to specified pages on a website, or the entire site itself. If you would like to choose exactly where the ad is shown, you will have to add managed placements. More than this, instead of manually doing it, you can allow Google to do it automatically, which will be done based on targeting methods, such as keywords.