Utilize the input text as a context reference, choose the right relationship between Sandisk and Western Digital 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.

* Sandisk rose 9.5 percent to $67.62 on a Bloomberg report, which said Micron Tech and Western Digital were in talks to buy the memory chip maker.

Answer: parent_organization