Take context from the input text and decide on the accurate relationship between 'Lehman Brothers' and 'investment' from the options provided.
Options: industry, currency, business division, owned by

At the time, global lenders were beefing up their capital-markets units in New York with a focus on the booming business to compete with U.S. investment banks such as Lehman Brothers Holdings Inc. and Bear Stearns Cos.
industry