What is included as part of the signature line in a letter?

In a formal letter, the signature line typically includes the sender's printed name, allowing the recipient to easily identify the author of the correspondence. The printed name serves as a clear indication of who is sending the letter and is often accompanied by a handwritten signature above it, making it personal and official.

While elements such as the date and the recipient's address are important components of a letter's format, they are not part of the signature line itself. Likewise, the subject serves to inform the recipient about the letter's content but does not belong to the signature portion. Therefore, the correct answer focuses on aspects that directly relate to the formal identification of the sender, which is pivotal in maintaining professional communication standards.