How are List-unsubscribes generated?

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How are List-unsubscribes generated?
A . A recipient opts out by using the Unsubscribe link in the email header.
B. A recipient opts out by using the List-unsubscribe button at the top of the email client.
C. A recipient opts out by using the Unsubscribe link in the email footer.
D. A recipient changes his or her newsletter information in the account profile.

Answer: B