Another answer lies in shifting investor expectations of market shocks, five years after the U.S. "flash crash" that briefly wiped out nearly $1 trillion in market value and seven years after the subprime crisis pushed investment bank Lehman Brothers into bankruptcy and redrew the financial landscape.
Utilize the input text as a context reference, choose the right relationship between 'Lehman Brothers' and 'investment bank' from the options.
Options: legal form, developer, product/material produced, owned by