What are the diagnostic criteria for social phobia according to the DSM-IV?

The person fears acting in a way that may be humiliating or embarrassing in one or more social situations.
The exposure to the feared social situation almost invariably provokes anxiety in the individual with social phobia.
The individual recognizes that the fear is excessive or unreasonable.
The symptoms of the disorder interfere significantly with the person's functioning in one or more areas.
a) I, II, and III are correct.
b) II, III, and IV are correct.
c) I, III, and IV are correct.
d) All of the above are correct.