Utilize the input text as a context reference, choose the right relationship between Liberty Mutual and Insurance from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

Rated A (excellent) XV ($2 billion or greater) by A.M. Best, Liberty International Underwriters is operating as a subsidiary of Liberty Mutual Insurance Company.

Answer: industry