Investment dealers:

A) brokers who make money by buying and selling securities at bid prices to make profits from the difference.

B) make money by buying at ask prices and selling securities at bid prices to make profits from the difference.

C) brokers who make money by buying and selling securities at ask prices to make profits from the difference.

D) make money by buying at bid prices and selling securities at ask prices to make profits from the difference.

E) none of the answers is correct.