According to administrative rules, the bookkeeping of trust accounts requires all of the following except?

The requirement for bookkeeping of trust accounts emphasizes the accountability and transparency necessary in handling clients' funds. While it's important to maintain organized records, the key focus of this question lies in understanding the specific administrative rules that govern trust account management.

The requirement that all transactions must be clearly documented is vital, as it ensures that every movement of money is traceable, promoting accountability. Maintaining individual client files supports the structure required to ensure that each client's funds are handled separately, preventing any mix-up of funds and protecting client interests. Additionally, the stipulation that records must be readily available for inspection reflects regulatory demands for openness and allows for oversight to ensure compliance with laws and regulations regarding the handling of trust accounts.

In contrast, the option regarding the necessity for a separate book for ledger maintenance is not a stipulated requirement under administrative rules. It suggests that the organization of records can be flexible, as long as all other criteria regarding documentation, client file maintenance, and availability for inspection are fulfilled. This approach is often adopted to allow different brokerages to employ varied systems of record-keeping while still adhering to the essential principles of trust account management.