Which of the following is NOT a type of directive?

The option stating "None of the above are types of directives" is not accurate because all the other mentioned choices are indeed recognized types of directives regarding healthcare decision-making.

A "directive to physician," often referred to as a living will or advance directive, explicitly communicates a patient's preferences for medical treatment in situations where they may not be able to express their wishes.

An "out-of-hospital DNR" (do not resuscitate) order is a specific directive indicating that a patient does not wish to receive resuscitation efforts in the event of a cardiac arrest or other life-threatening situation outside of a hospital setting.

A "health care proxy" is a legal document that designates an agent to make healthcare decisions on behalf of a patient in the event that they are incapacitated and unable to communicate their wishes themselves.

Since all these choices represent forms of advance directives aimed at guiding medical care based on patient preferences, the assertion that "none of the above are types of directives" is incorrect. Through this understanding, one can see the relevance of these directives in ensuring that a patient's health care wishes are honored.