To display all individual campaigns in a crosstab report, a report author could use the expression set([TrailChef Campaign],[EverGlow Campaign], [Course Pro Campaign]). Instead, the report author decides to use the parent member of the campaigns in the set expression "children([All Campaigns])". Which statement is true about the method that was used?
A. In the future, when a campaign is deleted or new ones are added, the report author must modify the expression.
B. In the future, when a campaign is deleted or new ones are added, the unmodified expression will be valid.
C. The report author should not have used the method chosen, as the first method is best in this situation.
D. To be accurate, the report author should avoid using a set expression.
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