Aliases can only be created for descrete dimensions. It can be assigned before and after creating a visualisation. remember changes to data in tableau do not affect underlying data in the data base. hence A
A is correct but C is not because in option C they are saying discrete measures which means when a measure is pulled in Viz as discrete (blue pill) then it acts as a discrete dimension but it is actually a measure. We cannot assign aliases to measures.
A is correct, because allises can only be used for discrete dimension. On top of that, it changes how the value is shown in the visualisation, rather than changing the value in the database.
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