When designing reports with multiple data sources, in which two ways is an association rule different from a class join? (Choose Two)

When designing reports with multiple data sources, in which two ways is an association rule different from a class join? (Choose Two)
A . A class join is required to add a filter condition to your report.
B . Anyone with the appropriate permissions can use associations when creating reports in the User portal.
C . Class joins are unique to each report. Associations are reusable in any report.
D . You can join multiple classes with class joins, while you cannot join multiple classes with associations.

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Answer: BC