This figure has rock units and geologic features that are assigned letters that are not in any particular order.From the geologic relations, what is the oldest unit or feature of those listed below? 
Definitions:
Adaptive Culture
An organizational culture characterized by flexibility, customer focus, and an ability to change in response to external conditions.
Customer Service
The assistance and support provided by a company to those people who buy or use its products or services.
Deculturation
The process of losing or diminishing certain aspects of one's original culture, often as a result of contact with another culture.
Assimilation
The process by which individuals or groups adopt the culture, attitudes, and norms of another group, often losing aspects of their original identity.
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