Which of the following is a broker dealer mentioned in the text?

Tullett Prebon is recognized as a broker-dealer in the financial services industry, specializing in inter-dealer brokering. This role involves facilitating trading between institutional clients and alternatively acting as a market maker. Broker-dealers are essential in providing liquidity to the markets and helping clients execute buy and sell orders.

While Goldman Sachs, J.P. Morgan, and BofA Merrill Lynch can also function in a broker-dealer capacity, they are predominantly known as investment banks or financial services firms, and thus may not always fit the term "broker-dealer" in the same narrow sense. Tullett Prebon's specific focus as a broker-dealer distinguishes it clearly in this context, making it the most appropriate choice among the options presented.