In which structure can an engineer apply usage labels to attributes?

The correct answer is the schema because it is within this structure that usage labels can be specifically applied to attributes. A schema defines the organization and characteristics of the data, including what attributes it contains and how they relate to each other. By utilizing usage labels within the schema, engineers can categorize attributes based on their intended use, such as whether they are required or optional, and how they should be handled in different contexts.

This is particularly important for governance, compliance, and data quality, as it helps ensure that all stakeholders understand how data should be interpreted and used. Additionally, schemas serve as blueprints for how data is structured and managed within systems, making them the appropriate level for applying such labels.

While other options like data models, datasets, and profiles are critical components within the Adobe Experience Platform, they do not directly focus on the application of usage labels to individual attributes in the way a schema does. Data models organize data relationships, datasets refer to collections of data, and profiles are tailored representations of individual entities, none of which specifically address the tagging of attributes at the schema level.