A food processing factory fills cans with vegetables. The filled cans are then sold to shops. Which wages are direct labour costs for the factory? 1 wages paid to workers who load the cans on to lorries for delivery to shops 2 wages paid to workers who operate machines that fill the cans with vegetables 3 wages paid to people working on the maintenance of the machinery in the factory 4 wages paid to people working on the assembly line putting labels on the cans