A nurse is teaching a client about advance directives. Which of the following statements by the client indicates an understanding of the teaching?

The correct answer is D because advance directives can be changed at any time by the individual as long as they are competent to do so. This shows an understanding of the flexibility and control one has over their own healthcare decisions. Choice A involving an attorney is not necessary for making changes to advance directives. Choice B about selecting a family member as a proxy is not related to making changes to advance directives. Choice C is incorrect as a nurse is not typically required to witness the signing of a living will.