Refer to the input text as context and select the correct relationship between 'Plug Power' and 'fuel cell' from the available options.
Options: product/material produced, distribution format, parent organization, legal form

Following the Feb 2014 announcement that Plug Power will supply 1,738 GenDrive fuel cell units to Wal-Mart’s six North America distribution centers over the next two years, its shares catapulted 133.8% till almost mid March.
product/material produced