With Amazon DSP, advertisers can access both 1P and 3P supply.

The correct answer is True because Amazon DSP allows advertisers to access both first-party (1P) and third-party (3P) supply. First-party supply refers to inventory directly available from Amazon’s own properties, such as Amazon.com and Amazon-owned apps, which includes high-quality, exclusive inventory. Third-party supply, on the other hand, refers to inventory sourced from external publishers and ad exchanges, providing access to a broader range of websites and apps across the open internet. This combination of 1P and 3P supply gives advertisers the flexibility to reach their target audience both within Amazon’s ecosystem and on a wide variety of other platforms, enabling more comprehensive campaign strategies.