The knowledge point to be investigated in analyzing this problem is the internal control of fund management companies. The internal control system of a fund management company consists of an internal control outline, a basic management system, departmental business rules and regulations and a business operation manual. The company's internal control procedure is the refinement and expansion of the internal control principles stipulated in the company's articles of association. It is the outline and overview of various basic management systems, and defines the internal control objectives, internal control principles, control environment and internal control measures. The basic management system mainly includes risk control system, investment management system, fund accounting system, information disclosure system, supervision and audit system, information technology management system, company financial system, data file management system, performance evaluation system and emergency system. Departmental business rules are specific descriptions of the main responsibilities, post settings, post responsibilities and operating rules of each department on the basis of basic management system. Business operation manual is the operation method of each specific business and management work, and it is the description and constraint of every detail and process of the business. The main business manuals include research manual, transaction manual, marketing manual, information technology manual, supervision and audit manual and financial work manual. So the answer to this question is ABCD.