Why do you enable the dynamic join option?

You combine two tables in a join node using multiple columns in each table.

Why do you enable the dynamic join option? Note: There are 2 correct answers to this question.
A . To ensure that the join execution only uses the join columns requested in the query
B . To ensure that the aggregation always happens after the join execution
C . To allow data analysis at different levels of granularity with the same calculation view
D . To force the calculation at the relevant level of granularity, even if this level is not the grouping level defined by the query

Answer: A,C