问题如下：
Financial intermediaries which do not trade directly with clients, they find buyers for and sellers of securities to execute customer orders instead. They are best described as:
选项：
A. brokers.
B. investment bankers.
C. dealers.
解释：
A is correct.
Brokers help their clients buy and sell securities by finding counterparties to trades in a cost efficient manner. Investment bankers provide advice to clients and help them arrange transactions such as IPO and debt offerings. Dealers facilitate trading by buying for or selling from their own inventories, provide liquidity in the market.
请问，broker不直接和clients trade吗？该怎么理解题干，谢谢！
