A. Victim carelessness. 受害者的錯(cuò)心大意
B. Collusion with others in information processing. 與他人勾結(jié)處理信息
C. System design flaws. 系統(tǒng)設(shè)計(jì)的缺陷
D. The fraudster obtaining advanced training & special knowledge. 受過高級(jí)培訓(xùn)或掌握特殊技能的詐騙者