What Distinguishes Financial Intermediaries from Industrial Firms

What distinguishes financial intermediaries from industrial firms?

A) FI balance sheets are almost totally comprised of financial assets while commercial firms hold substantial amounts of real assets.
B) Industrial firms are the customers of FIs, but FIs cannot be customers of industrial firms.
C) FIs deal exclusively in primary securities, but industrial firms specialize in secondary securities.
D) Industrial firms produce real goods or services while FIs only produce money.
E) Industrial firms are unregulated while FIs are heavily regulated.