What are the 3 main components of the SmartEvent Software Blade?

What are the 3 main components of the SmartEvent Software Blade? 1) Correlation Unit 2)
Correlation Client 3) Correlation Server 4) Analyzer Server 5) Analyzer Client 6) Analyzer
Unit

A.
4, 5, 6

B.
1, 2, 3

C.
1, 3, 4

D.
1, 4, 5