The correct answer is: B. electronic communications networks (ECNs).
An electronic communications network (ECN) is a computerized trading network that matches buy and sell orders electronically entered by customers. ECNs are an alternative to traditional stock exchanges, and they offer a number of advantages, including lower fees, faster execution, and greater transparency.
A national markets system (NMS) is a network of electronic trading systems that allows for the trading of securities across multiple markets. The NMS was created by the Securities and Exchange Commission (SEC) in 1997 to promote competition and efficiency in the securities markets.
An internet investment service is a service that provides investment advice and information to investors over the internet. Internet investment services can be provided by a variety of companies, including brokerage firms, banks, and mutual fund companies.
A global investment network is a network of financial institutions that allows for the trading of securities across multiple countries. Global investment networks can be used by investors to access a wider range of investment opportunities and to diversify their portfolios.
In conclusion, the correct answer is: B. electronic communications networks (ECNs).