industry has lowered its labor costs through\nthe use of tablet computers.\nadvances in robotics.\nfaster…

Brief Explanations:

Advances in robotics can replace human - labor, directly reducing labor costs. Tablet computers are mainly for work efficiency in some tasks rather than labor - cost reduction. Faster communications may improve overall business operations but not directly lower labor costs. Just - in - time manufacturing is about inventory management rather than labor - cost reduction.

Answer:

advances in robotics.