According to the reading, a clinician might suspect a diagnosis of _____ disorder if a child displays patterns of behavior in which he or she exhibits reduced or absent reticence in approaching and interacting with unfamiliar adults; overly familiar verbal or physical behavior; diminished or absent checking back with an adult caregiver after venturing away, even in unfamiliar settings; and/or willingness to go off with an unfamiliar adult with little or no hesitation.