Which operating system has the least amount of users?

Technician a says that a dry sump system uses no oil storage sump under the engine. technician b says that a wet sump system uses no oil storage sump under the engine. who is correct?

Im doing this last minute and literally none of my neighbors or people that my dad works with use excel so if anyone could me make up an example

What is a scenario where records stored in a computer frequently need to be checked