A nurse is reviewing a pamphlet about post-traumatic stress disorder. Which of the following client statements indicates understanding of the information?

"Post-traumatic stress disorder always starts within three months of a traumatic event."

"Post-traumatic stress disorder is rarely associated with a significant loss."

"Post-traumatic stress disorder is physiological manifestation of stress."

"Post-traumatic stress disorder is a mental disorder that may result from experiencing complicated grief."