Which of the following describes Amazon Publisher Services(APS)?(Select2)

Amazon Publisher Services (APS) is Amazon's marketplace of directly integrated sites and apps. This means publishers directly integrate with Amazon's ad server, allowing for a more efficient and transparent auction process for their inventory. This direct integration helps reduce latency and can lead to better monetization for publishers and more effective ad placements for advertisers. The option "Exclusive supply sources available in Amazon DSP" is also correct because APS inventory is a unique and exclusive supply source within the Amazon DSP ecosystem, offering advertisers access to premium publisher inventory that might not be available elsewhere. The option "Invitation-only marketplace allowing select buyers to bid on impressions" is incorrect because APS is a publisher-centric service, not a buyer-centric one. While there are certain quality controls for publishers, it's not an "invitation-only marketplace" for buyers.