What does the term iron triangle describe? the tense relationship between the three branches of the government the difficult relationship between the three branches of the military the working relationship between the cia, the nsc, and the pentagon the complex interactions between congress, interest groups, and the federal bureaucracy?

The telegraph, the transatlantic telegraph cable, and the telephone were important to businesses after 1850 because of a. they created a system for developing new inventions. b. they filled a need that other inventions of the day could not. c. they attracted investors and created the stock market. d. they made picture-taking a popular american pastime.