Apply ad quality standards, require Platform audit.
Apply ad quality standards, trust buyer self-classification.
Bypass ad quality standards, require platform audit.
Bypass ad quality standards, do not require audit.
Ban all creatives.
The difference between trusting buyer self-classification and requiring a platform audit is that you trust that buyer to correctly self-classify all creatives that they do not opt into AppNexus audit. When uploading their creatives and tags, buyers with this classification are asked to confirm that they have self-classified any creative for compliance with AppNexus' creative standards.