What is the relationship between Halliburton and HOUSTON in the context of the input sentence. Choose an answer from: 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.

HOUSTON (Reuters) - The strong valuation of engineering and construction firm KBR Inc. ( KBR.N ) will likely prompt directors of parent company Halliburton Co. ( HAL.N ) to vote to give KBR shareholders a chance to exchange stock in Halliburton for their newly listed business, analysts said.

Answer: headquarters_location