Which of the Following Is Needed to Effectively Manage One's

Which of the following is needed to effectively manage one's medical problems?

A) You need to learn to how to be a good observer and assess your symptoms.
B) You need to be able to decide when to seek professional advice.
C) You need to know how to safely self-treat common medical issues.
D) You need to learn to how to be a good observer and assess your symptoms and to be able to decide when to seek professional advice.
E) All of these choices are needed.