Answer:C. Trade listed security in an auction market
Step-by-step explanation:
A broker is an agent in the securites market that deals in the purchase and sales of securities for a return referred to as brokerage.
The securites market is an auction market for securities.
He may or may not trade from his own inventory, his trading his not restricted to foreign securities,he may trade physically or electronically and he his a principal trader of not only debt securities but including equity securities.