Take context from the input text and decide on the accurate relationship between 'Halliburton' and 'HOUSTON' from the options provided.
Options: headquarters location, creator, legal form, director/manager

HOUSTON (Reuters) - Business is so tough for oilfield giants Schlumberger NV and Halliburton Co that they have come up with a new sales pitch for crude producers halting work in the worst downturn in years.
headquarters location