Aperson with a panic disorder:
a. is usually also depressed.
b. has sudden flashbacks of a bad incident.
c. feels anxious all of the time.
d. has sudden attacks of anxiety.

Hello.

I'm pretty sure the answer is D) has sudden attacks of anxiety.

Have a great day! :)

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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.