Which of the following is not a limitation or challenge of relying on advanced directives in end-of-life care? Choose all that apply."
A) The need for ongoing communication and reevaluation of patients' wishes over time
B) Legal and ethical considerations that may vary by state or situation
C) The potential for ambiguous or unclear instructions
D) The need to obtain a court order to implement an advanced directive
E) Limitations in certain situations, such as sudden medical emergencies