Which method of serving a subpoena requires the addressee to acknowledge receipt?

The method of serving a subpoena that requires the addressee to acknowledge receipt is through certified mail. This approach ensures that the sender receives a return receipt, which serves as proof that the addressee has received the document. Certified mail provides a more secure and accountable means of delivery compared to standard methods like first-class mail, as it includes tracking and requires a signature upon delivery. This acknowledgment is important in legal processes to demonstrate that the recipient has been informed of their obligations regarding the subpoena.

In contrast, personal service involves handing the subpoena directly to the individual, which does not require a separate acknowledgement and serves its purpose in a different manner. First-class mail does not necessitate a confirmation of receipt, lacking the legal assurance that the addressee has received the documents. Thus, certified mail stands out as the correct answer due to its requirement for acknowledgment of receipt, which is crucial in legal proceedings.