An account will be providing a unique key for each subscriber from an external system. A marketer wants to create a data

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An account will be providing a unique key for each subscriber from an external system. A marketer wants to create a data extension for sending email campaigns.
Which two steps should the marketer take when creating the data extension? (Choose two.)

A. Set the column with Subscriber Key as Primary Key
B. Set the Email address column as Primary Key
C. Relate the Email Address to Subscriber Key
D. In Properties, check the ג€Is Sendableג€ option