Which of the following are true?

Amazon DSP has specific requirements for third-party elements to ensure proper tracking and ad serving. If a third-party pixel is directly appended to a creative and Amazon Ads has a server-to-server integration with that third party, the creative will indeed be rejected. This is because Amazon DSP prefers to manage these integrations through its own system for consistency and data accuracy. In such cases, the correct procedure is to remove the pixel and instead use the adapter URL provided by Amazon Ads, which facilitates the server-to-server communication. Additionally, Amazon Ads maintains a curated list of approved third-party ad servers. Advertisers are permitted to use third-party served creatives, but only if their chosen ad server is on this approved list. This policy helps maintain quality control and compatibility within the Amazon DSP ecosystem. Therefore, all statements are true regarding Amazon DSP's policies on third-party pixels and ad servers.