Question: One of the most important and innovative contributions of behavioral dialectic therapy in the treatment of borderline personality disorder (BPD) is: 
 Options:  <1> The integration of the psychodynamic perspective and the behavioral perspective. <2> The incorporation of group therapy. <3> The introduction of written material for patients to support therapy. <4> The emphasis on acceptance and validation as a prerequisite for achieving change. <5> The treatment of patients with BPD in the context of family therapy.
4