Which supply option should an advertiser select to access inventory from Amazon's direct publisher integration?

Amazon Publisher Services (APS) is the correct option because it is Amazon's proprietary header bidding solution that directly integrates with publishers, including Amazon's own properties and third-party publishers. This direct integration allows advertisers using Amazon DSP to access high-quality inventory with greater transparency and efficiency. Private marketplaces (PMPs) are deals between a single buyer and seller, offering curated inventory but not exclusively Amazon's direct publisher integration. Amazon O&O properties refer to Amazon's owned and operated sites and apps, which are part of the inventory available through APS, but APS is the mechanism to access it. Third-party exchanges are broader ad exchanges that aggregate inventory from many publishers, but they don't specifically refer to Amazon's direct publisher integration.