A health care provider suspects a client has developed posttramatic stress disorder (PTSD). Select the necessary criterion to validate the diagnosis?
a) an impaired deficit of memory and concentration for greater than a 6-month period after a traumatic even has occurred
b) at least 1 month of clinically significant distress affecting a person after witnessing or experiencing a traumatic event that affects other parts of his or her life
c) a positron emission tomography (PET) scan that demonstrates that a client has decreased reactive of the anterior cingulate and orbitofrontal areas after a traumatic event
d) a functional magnetic resonance imaging (MRI) scan that demonstrates that a client has decreased reactivity of amygdala and hippocampus after a traumatic event