What is the key difference between Rules and Building Blocks in QRadar?

What is the key difference between Rules and Building Blocks in QRadar?
A . Rules have Actions and Responses; Building Blocks do not.
B . The Response Limiter is available on Building Blocks but not on Rules.
C . Building Blocks are built-in to the product; Rules are customized for each deployment.
D . Building Blocks are Rules which are evaluated on both Flows and Events; Rules are evaluated on Offenses of Flows or Events.

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Answer: A