Take context from the input text and decide on the accurate relationship between 'Plug Power' and 'fuel cell' from the options provided.
Options: platform, member of, legal form, product/material produced

Leading fuel cell developer, Plug Power Inc. PLUG enjoyed an upswing of as much as 14.8% on Monday to close at $2.17 per share on conjectures that big orders could be on the way from Atlanta, GA-based home improvement retailer The Home Depot, Inc. HD.
product/material produced