A user of Yahoo!® Answers asked the question,
What are the 4 types of network operating systems that available [sic] in the market?
Seeing the opportunity to put in a small plug for Our Favorite Operating System™, yours truly posted a description of VMS as a network OS and was rewarded with 10 points for having my answer chosen as the best. [It's true there wasn't much competition…]
Click here to go to Yahoo!® Answers and see the question and both of the answers that were submitted.
I wasn't sure initially that I was answering the question that was intended, as the wording was a little vague. How is one supposed to take the word type? As in, What type of food do you like best? Or perhaps more colloquially, as indicating the actual name of something. In which case the question could have been worded more clearly as, What are the names of the four network operating systems that are available in the market? But I guess the 10 points proves I was aiming in the right direction, even though I only supplied the name of one O.S.
(Come to think of it, the last few times I've visited the two local markets there weren't any operating system on sale at all. And neither Giant nor Safeway would give me a rain check!)