The person who play a role of buying and selling of investment as regards the question is a Broker.
- A broker can be regarded as an individual or firm which serve as intermediary between the investor as well as securities exchange.
- Securities exchange will only recognize and accept orders individuals or firms that are part of their members in the exchange system, so that's why service of a exchange members ( broker)is needed by individual traders and investors.
- Because of Regulatory restraints, the broker must serve as pure intermediary, when he/she is taking responsibility of buying or selling investments of their clients.
Therefore, option C is right.
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