What distinguishes a Sendable Data Extension from a non-sendable extension?

• A. A Sendable Data Extension maps fields to a subscriber key and an email address (or other sendable identifiers) for sends; a non-sendable DE stores data used for lookups or personalization but is not used to drive sends directly.
• B. A non-sendable DE is used for sends, while a Sendable DE is used for lookups.
• C. Both are interchangeable; there is no difference.
• D. A Sendable DE only stores subscriber emails and nothing else.

Answer: (A)