问题如下：
Which of the following statements is correct?
选项：
A. Secondary market bond transactions most likely take place in dealer markets.
B. Secondary market bond transactions most likely take place on organized exchanges.
C. Secondary market bond transactions most likely take place in brokered markets.
解释：
A is correct.
In secondary market, dealers post bid and ask prices and earn a spread between them. Secondary market bond transactions most likely take place in dealer markets.
老师 dealer market 和 brokered market 区别有哪些？