industry has lowered its labor costs through\n- the use of tablet computers.\n- advances in robotics.\n…

Brief Explanations:

Advances in robotics can automate tasks previously done by human - labor, thus reducing labor costs. Tablet computers are more for data access and communication in the workplace rather than directly reducing labor costs. Faster communications may improve efficiency but not necessarily cut labor costs. Just - in - time manufacturing is more about inventory management than labor cost reduction.

Answer:

Advances in robotics.