HOUSTON Aug 7 (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.
Take context from the input text and decide on the accurate relationship between 'Halliburton' and 'HOUSTON' from the options provided.
Options: distributed by, headquarters location, creator, stock exchange