Storm中的Stream Groupings有哪几种方式

The imperial government was a political labyrinth of personal, provincial,regional, racial, ideological and functional groupings and relationships-confusing to the novice and to the foreigner.

In terms of the data relationships found by data mining, associations refers to: A: patterns that describe a group to which an item belongs. B: occurrences linked to a single event. C: undiscovered groupings. D: events linked over time.