Which of the following is a key feature of an Advance Health Directive?

An Advance Health Directive is fundamentally designed to communicate a person's preferences regarding their healthcare in advance of situations where they may not be able to express their wishes due to illness or incapacity. The key feature that makes option B the correct choice is that it explicitly allows individuals to give instructions about their care preferences ahead of time, thus ensuring that their choices are respected even when they are unable to voice them.

In contrast, the other options present features that do not align with the principles of an Advance Health Directive. For example, the requirement for it to be verbal contradicts the intent of a written directive, which serves as a formalized document outlining care preferences. Additionally, Advance Health Directives are not created by healthcare providers; they are established by individuals to reflect their personal wishes regarding treatment. Lastly, while some jurisdictions have specific witnessing requirements to validate an Advance Health Directive, the lack of a requirement for witnesses in every scenario does not reflect its key feature, which is the ability for individuals to document their care instructions thoroughly and clearly.