How does Magento store customer address attribute values?

How does Magento store customer address attribute values?
A . Customer address is a flat entity, so all values are stored in the customer_address_entity table
B . Customer address is not an entity, so its properties are customer attributes
C . Customer address is an attribute of the customer, so it doesn’t have its own attributes
D . Customer address is an EAV entity, so all values are stored in the customer_address_entity table and related values tables

Answer: D