Jean told her stockbroker to purchase 300 shares of stock of company abc at $20 per share. The fee that the stockbroker charges for this service is called Commission. Hence, option D is correct.
Stockbroker is the person who execute the shares and invest in them on the behalf of their clients. Stockbroker has certain knowledge about the trading of shares, so using their ability of understanding the stock market.
Many of the stockbroker works for the firm or company and handle their customer's accounts and do tradings.
Thus, option D is correct.
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a. Dividend
b. Yield
c. Net Proceeds
d. Commission