问题如下图：
选项：
A. 
B. 
C. 
什么时候broker把一家公司放在restricted list里面？
是与投行部门有业务关联时还是只有当研究所知道了投行部门发的内幕信息时？
如果和投行部门有业务联系时，是不是只要披露给客户就可以继续写研究报告而不放在restricted list里面了？
Establish physicaninformationbarriers within the firm to prevent the exchange of information between the investment banking anbrokerage operations. Monitor the exchange of information between the investment banking partment anthe brokerage operation. B is correct. The best polito prevent violation of StanrII(–MateriNonpublic Information is the establishment of firewalls in a firm to prevent exchange of insir information. The physicaninformationbarrier of a firewall between the investment banking partment anthe brokerage operation prevents the investment banking partment from proving information to analysts on the brokerage si who mwriting recommentions on a company stock. Prohibiting recommentions of the stoof companies thare clients of the investment banking partment is alternative, but answer A states ththis prohibition woulpermanent, whiis not the best answer. Onoffering is complete anthe materinonpublic information obtainethe investment banking partment becomes publiresuming publishing recommentions on the stois not a violation of the Co anStanr because the information of the investment banking partment no longer gives the brokerage operation aantage in writing the report. Answer C is incorrebecause no exchange of information shouloccurring between the investment banking partment anthe brokerage operation, so monitoring of suexchanges is not effective complianprocere for preventing the use of materinonpublic information. 老师请问，监控两个部门的股票交易也是无效的，对吧？可以一下原因吗？
A为什么不可以？A可以一劳永逸
