Which production process would require the most mechanistic structure $($standardized jobs and formalized procedures$)?$

$$ A company using large batch and mass production like an automobile manufacturer.

A company that uses a continuous process where the entire process is done by machines as it would be at an oil refinery or a nuclear power plant.

A professional services company like an advertising agency or a consulting firm.

A company using small$-$batch and unit production like a company that manufactures handmade Kelly handbags.