Visitor Visa - B2

Thanks a lot immihelp and all the users who posted their experiences. My parents had interview on april 30th , 2009. Only 3 questions were asked.
1. Mr. xxxx(my husbands name) is who?
Dad: my son-in-law.
2. Where does he work?
dad: at yyyyyyy
3. Since when are you working at your job.
dad: for xxx years.

After this they said to go for fingerprinting. When they came back, the officer said your visa has been approved. No documents were checked. But we have been having mock interviews for the last 1 week. I think being confident at the interview really works. My dad also mentioned that the officer was very gentle, courteous and respectful. All the best for all the others who are trying for visa.
  I don't know if it is multiple entry or single entry as they havent recieved their passport yet.