Final answer:
Data extensions allow for add/update Import activity, can store HTML code as an attribute, and support Customer ID as the unique identifier.
Step-by-step explanation:
The statement that differentiates the use of data extensions over lists is A. Data extensions allow for add/update Import activity. Data extensions provide more flexibility when it comes to importing and updating data in the Marketing Cloud. Lists, on the other hand, are limited to simple subscriber management, while data extensions can be used for more advanced data management activities.
For example, in this scenario, the customer wants to perform a full refresh of their data every night. This can be easily achieved using a data extension and an Import activity, allowing for efficient and automated data updates.
Data extensions can also store HTML code as an attribute, which is necessary in this case, as the customer data file includes a specific attribute that will be used to populate Account Access content areas in emails. Lists do not have this capability.
Additionally, data extensions support using a Customer ID as the unique identifier for each contact. This allows for more accurate and efficient tracking of customer interactions and personalization.