Discuss two benefits or advantages of each online research method you described as opposed to the offline/traditional method. (For this area, you are to think about how the online methods may be better than the traditional methods.)
Like that for ex it states 2 benefits from each primary research method we choose. So that would been (web based survey, online polls and online observation. 

Discuss two disadvantages of each of the online research methods you described as opposed to the offline/traditional method. (For this area, you are to think about how the online method may be less desirable than the traditional methods.) Again, it states for each research method choose. (web based survey, online polls and online observation.