Last year, Morgan Stanley acted as a when it earned profits by means of match-making in an IPO (initial public offering) process between Firm ABC and David, who is a professional investor; as a result, Firm ABC became successfully listed in Shenzhen Stock Exchange. Over the past one year, David has not been satisfied with the performance of Firm \\( A B C \\), and hence, he just sold all his stocks in Firm \\( A B C \\) to different investors; this transaction of ownership transfer is taking place in A. Financial broker, Primary market B. Financial intermediary, Primary market C. Financial broker, Secondary market D. Financial intermediary, Secondary market