FIs perform their intermediary function in two ways:

a. They specialize as brokers between savers and users and they directly control the quantity of outside money in the economy

b. They specialize as brokers between savers and users and they serve as asset transformers by purchasing primary securities and issuing secondary securities

c. they serve as asset transformers by purchasing primary securities and issuing secondary securities and they directly control the quantity of outside money in the economy

d. they serve as asset transformers by purchasing secondary securities and issuing primary securities and they directly control the quantity of outside money in the economy