Intel Corp. bought a 20% stake in Tsinghua Unigroup last year for $1.5 billion.Tsinghua Unigroup, which was founded in 1988 by China’s elite Tsinghua University, became China’s largest chip design firm in 2013 after acquiring two of the country’s largest mobile-chip firms, Spreadtrum Communications and RDA Microelectronics.Micron, based in Boise, Idaho, is the last remaining U.S. maker of the widely used chips known as dynamic random access memory, or DRAMs.
In the context of the input sentence, determine the relationship between 'Spreadtrum' and 'Tsinghua Unigroup'.
Options: product/material produced, operator, member of, parent organization