Utilize the input text as a context reference, choose the right relationship between 'Lehman Brothers' and 'investment' from the options.
Options: currency, business division, industry, 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