1. A control unit for operating a motor vehicle equipped with a plurality of actuators and sensors, the control unit comprising: one or more processors and associated memory configured to comprise: a basic module and a function module, the function module being constructed in a secured run-time environment; and predefined first and second interfaces, each coupling the basic module and the function module; wherein the basic module is configured to: determine one or more function input quantities based on at least one operating quantity received from at least one of the sensors; provide the one or more function input quantities to the function module via the first interface; determine control variables of the actuators based on one or more output quantities received from the function module via the second interface; wherein the function module is configured to: determine the one or more output quantities based on the one or more function input quantities received from the basic module via the first interface and a predefined quantity of rules, wherein the one or more output quantities characterize an operating strategy from a quantity of predefined operating strategies; and provide the one or more output quantities to the basic module via the second interface.