What does "direct democracy" mean?
a that people vote on laws themselves, without representatives. incorrect answer
b that only certain people can serve on juries and hold office. incorrect answer
c that people who've committed crimes can't vote. incorrect answer
d that state legislatures elect representatives, not the people themselves.

An informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.