What tool could NTO use to alleviate the number of filtered audiences that are created for sending?

Northern Trail Outfitters (NTO) completed a data review process and discovered their data extension folders contain hundreds of filtered data extensions which are never used.

What tool could NTO use to alleviate the number of filtered audiences that are created for sending?
A . Data Filter
B . Filtered Group
C . Filter Activity
D . SQL Query Activity

Answer: C

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