Final answer:
Operators are responsible for ensuring class C and F buses are checked annually and semiannually, as they own and operate these vehicles and must comply with transport regulations.
Step-by-step explanation:
The responsibility for having buses of class C and F checked annually and semiannually falls on the operators. Operators are either individuals or companies that own and operate the buses. They must ensure that their vehicles are safe for road use and comply with all regulations. This includes adhering to mandatory inspection schedules set by government bodies, typically the Ministry of Transport or a similar oversight authority. While the drivers are responsible for the day-to-day operation of the buses and must report any issues, it is not their responsibility to arrange inspections.