Alfresco is not even listed as one of the options on the first question.
And since Alfresco is both "Commercial" AND "Open Source" which category does it fit? I was stumped by the first question.
I think if you take time to consider your questions you may get better results.
And also there are rather too many of these type of surveys. Yes its not your problem, but globally there are a lot of students asking similar stuff that can be researched online.