Which of the following is NOT one of the four layers of brand visibility?

The operational framework for optimizing a Brand Entity across generative engines consists exclusively of four strategic tiers: Brand Discoverability, Brand Clarity, Brand Authority, and Brand Trust . While generating revenue is an ultimate business goal, tracking direct user transactions is not a structural evaluation layer utilized by AI systems to synthesize answers. Agentic search optimization focuses on building top-of-funnel recognition and source credibility rather than measuring bottom-of-funnel sales metrics directly within the synthesis process. Auditing an entity's digital footprint requires measuring signals that influence algorithmic retrieval and recommendation rather than immediate financial outcomes.