Bond funds and currency funds will fall into three categories: A, B, and C based on different charging methods. Category A and B are one-time charges, while category C is a daily charge. Category A generally represents front-end charges, Category B represents back-end charges, and Category C has no subscription fees, that is, there are no handling fees for either front-end or back-end. It is recommended to comprehensively consider the investment period and predict risks in advance.