The knowledge point to be investigated in analyzing this topic is the relationship between the parties of securities investment funds. The relationship between the administrator and the custodian is a kind of balance relationship. The fund manager is the organizer and manager of the fund, and is responsible for the management of fund assets, which is the core of fund operation; The custodian shall be a financial institution recognized by the competent authority, be responsible for the custody of the fund assets, dispose of the fund assets according to the instructions of the fund management institution, and supervise whether the investment operation of the manager is legal and compliant. So, the answer to this question is B.