What is the relationship between 'Realogy' and 'Coldwell Banker' in the context of the input sentence.
Options: legal form, subsidiary, chairperson, operator

Realogy Holdings Corp. ( RLGY ) is a global leader in residential real estate franchising and brokerage with many of the best-known industry brands including Better Homes and Gardens® Real Estate, CENTURY 21®, Coldwell Banker®, Coldwell Banker Commercial®, The Corcoran Group®, ERA®, Sotheby's International Realty® and ZipRealty®.
subsidiary