Comprehensive and Detailed Explanation:
The correct answer is D - Contact Builder Attribute Groups.
* Contact Builder Attribute Groups allow you to combine multiple Data Extensions (e.g., purchases and loyalty membership) into one relational view.
* Then you can easily query and filter based on conditions like "purchase date in last 6 months AND not a loyalty member."
# Why others are wrong:
* A: Behavioral Triggers are related to real-time actions like website behavior, not cross-data queries.
* B: Advertising Studio is for paid advertising, not internal audience segmentation.
* C: Customer Data Platform (CDP) would be overkill unless NTO had an enterprise-wide CDP already (which isn't mentioned).
Exact Extract from Salesforce Official Documentation:
Salesforce Help - Contact Builder Attribute Groups Overview:
"Use Attribute Groups to define and model relationships between data extensions and organize contact attributes to create targeted audiences." (Source: https://help.salesforce.com/s/articleView?id=sf.mc_cb_attribute_groups.htm)
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