What are two consequences of this change?

Northern Trail Outfitters (NTO) is launching a new campaign, driving it to redesign its data structure. NTO needs to change the cardinality between two data extensions inside Contact Builder.

What are two consequences of this change? Choose 2 answers
A . All filters created before will adapt automatically to the new cardinality.
B . All scheduled sends using a filter based on one of the data extensions should be reviewed.
C . A contact may NOT show up in the filter based on one of the data extensions.
D . One of the data extensions must be deleted from the attribute group in order to change the cardinality.

Answer: B,C