Which of the following email headers specifies an address for mailer-generated errors, like "no such user" bounce messages, to go to (instead of the sender’s address)?

Which of the following email headers specifies an address for mailer-generated errors, like "no such user" bounce messages, to go to (instead of the sender’s address)?
A . Errors-To header
B . Content-Transfer-Encoding header
C . Mime-Version header
D . Content-Type header

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Answer: A