Utilize the input text as a context reference, choose the right relationship between 'Trulia' and 'Zillow' from the options.
Options: platform, chief executive officer, parent organization, chairperson

Although Zillow and competitor Trulia ( TRLA ) have a 90% to 95% access to real estate listings, Realtor.com has upwards of 98% coverage with superior timeliness.
parent organization