An email's message header contains ____.

A) the primary recipient(s)
B) the subject of the message
C) the message area
D) a signature line

Message Header

The section of an email or message that contains metadata such as the sender, recipient, date, and subject.

Primary Recipient(s)

The main addressees of a message or email, intended as the direct targets of the communication.

Signature Line

A space or line in a document where an individual's signature is written, indicating agreement or consent.