Which Amazon DSP service model allow advertisers to create campaigns on their own and without insertion orders?

The selected answer Self-service is correct because the self-service model in Amazon DSP allows advertisers to create, manage, and optimize their campaigns independently without the need for insertion orders. This model provides advertisers with full control over their campaign setup, targeting, and budget, enabling them to run campaigns directly through the DSP platform. In contrast, the managed service model involves Amazon's team handling the campaign setup and management, often requiring insertion orders for execution. The self-service option is ideal for advertisers who prefer to manage their campaigns on their own, leveraging Amazon's tools and data to optimize performance.