Which of the following best represents an Advance Directive?

An Advance Directive is fundamentally designed to articulate an individual's healthcare preferences in the event that they are unable to communicate their wishes due to incapacitation. This document primarily focuses on specifying the type of medical treatment a person would like to receive or avoid, thereby ensuring that their values and choices regarding medical care are respected.

This is inherently different from the other options, which either do not specifically pertain to healthcare preferences or lack the comprehensive and personal touch that an Advance Directive embodies. Financial decisions can be relevant in some contexts of healthcare but are not the primary focus of an Advance Directive. A healthcare power of attorney is a specific type of Advance Directive that designates an individual to make healthcare decisions on a person's behalf; however, it doesn't encompass the full scope of personal preferences which are detailed in a broader Advance Directive. Similarly, a standard healthcare admission form is more administrative and does not capture the individualized intentions regarding treatment preferences that an Advance Directive aims to convey. Thus, the option representing a document outlining a person’s healthcare preferences accurately encapsulates the essence and purpose of an Advance Directive.