Utilize the input text as a context reference, choose the right relationship between Plug Power and fuel cell from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

This fuel cell maker has deployed 172 Plug Power Gen-Drive fuel cells for the center's forklift trucks.

Answer: product_or_material_produced