Refer to the input text as context and select the correct relationship between 'Western Digital' and 'Software' from the available options.
Options: developer, stock exchange, product/material produced, distribution format

Stronger Reactions That didn’t keep investors from piling into stocks like Western Digital Corp. and Check Point Software Technologies Ltd., which rose at least 7 percent after surpassing analyst estimates by a smaller margin than the overall index.
product/material produced