Which of the following is NOT one of the three fund structures in maintenance management?

In maintenance management, fund structures are essential for organizing how resources are allocated for various purposes. The general fund, internal service fund, and enterprise fund are recognized financial structures typically used in this context.

The general fund is used for day-to-day operations and covers a wide array of essential services. The internal service fund is utilized for services provided within an organization, such as maintenance and repairs, essentially functioning as an internal marketplace for resource distribution. The enterprise fund is set up for specific business-type activities that operate more like a private sector business, where services are provided to the public and are expected to be self-sustaining through user fees.

The operational fund, however, is not recognized as a standard fund structure within maintenance management. While there may be operational costs associated with maintenance, the term "operational fund" does not adhere to the established models used within public and organizational finance. This distinction is critical for maintaining clarity in financial planning and resource allocation in maintenance management practices.