What constitutes valid service of process on an individual?

Valid service of process on an individual requires that the individual receive the legal documents in a manner that ensures they are aware of the proceedings against them. Delivery to the individual personally is the most direct and effective method because it guarantees that the person receives the documents. In addition, acceptable alternative methods can include service through an individual in a manner consistent with jurisdictional rules, such as registered or certified mail in some circumstances.

Utilizing only the individual's attorney for service is not sufficient unless the attorney has formally accepted service on behalf of the client. Sending documents via regular mail does not meet the legal standard for service of process, as it does not confirm receipt and may not be seen as sufficient to notify the individual of legal proceedings. Posting documents at the individual's residence, while may have particular rules governing it in some jurisdictions, generally does not equate to personal service and can also risk failing to effectively notify the individual about the expected court actions. Hence, the first choice encompasses the necessary components for valid service, making it the correct answer.