What is the format that a subpoena must substantially follow?

The correct answer refers to Rule 84, Form 9, which specifies the required format for a subpoena. This rule outlines essential elements that must be included in the subpoena, such as the name of the court, title of the action, and instructions for compliance. Following this format ensures that the subpoena is legally valid and that the recipient understands their obligations. By adhering to the specific guidelines set forth in Rule 84, one can avoid potential challenges to the subpoena's enforceability, thereby facilitating the proper administration of justice.