You can set up a private marketplace deal manually or through an API.

The correct answer is true because a private marketplace (PMP) deal can indeed be set up both manually and through an API. Manual setup typically involves interacting with a user interface, where the advertiser and publisher negotiate terms and select inventory, while the API setup allows for automated creation and management of PMP deals, providing a more efficient and scalable solution for buyers and sellers. This flexibility supports different preferences and workflows, making it easier for users to choose the method that best fits their needs.