How do SPF and DKIM relate to SFMC sends, and how are they configured?

• A. SPF and DKIM authenticate your sending domain; configure by enabling Domain Management in Setup, add your sending domain in Marketing Cloud, and publish the appropriate CNAME/DKIM records in DNS to sign messages.
• B. They are optional and automatically applied without configuration.
• C. They are used only for inbound messages and do not affect outbound sends.
• D. They are configured within each email's header manually by the sender.

Answer: (A)