Final answer:
Purchased inventory for a campaign in Campaign Manager should be entered in Placements, where details of ad distribution are specified.
Step-by-step explanation:
The purchased inventory for a campaign in Campaign Manager would typically be entered under Placements. A placement is where you specify the details about where your ads will run and can include the purchased inventory information.
Floodlight tags are used for conversion tracking, Campaigns is too general and would contain a variety of information and components including placements, while Landing pages are where the user ends up after clicking on the ad, not where the inventory is managed.
Purchased inventory for a campaign would be entered in Placements in Campaign Manager
Purchased inventory for a campaign in Campaign Manager should be entered in Placements, where details of ad distribution are specified.