基础课上讲到应该分立，但是书后第20题答案原文如下：
C is correct. Separating the roles of chairman and chief executive officer is not a
required
attribute of an effective corporate governance policy. There is disagreement as to whether separating the roles of chairman and chief executive officer is an effective corporate governance attribute. The other attributes listed are part of an effective governance system.
(Institute 270)
Institute, CFA. 2018 CFA Program Level II Volume 3 Corporate Finance. CFA Institute, 07/2017. VitalBook file.
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所以这个职位要不要分立有没有明确说法？
