5年

问题如下：

Without specific rules from regulators or internal company guidelines, what is the minimum duration for keeping records as advised by the CFA Institute?

选项：

A.three years

B.five years

C.seven years

解释：

Option C is correct. Per Standard V (C) of the CFA Institute, which addresses Investment Analysis, Recommendations, and Actions - Record Retention, in situations where there are no explicit regulatory or company policies on record retention, the recommendation is to keep records for a minimum of seven years. This guideline is in place to ensure that members, candidates, and their firms comply with potential regulatory requirements and maintain a standard for professional conduct and responsibility.