What happens when a blade is added to an existing 7x17TB FlashBlade system?

What happens when a blade is added to an existing 7x17TB FlashBlade system?
A . The system gains ~1GB of write performance and ~15TB of capacity.
B. The system gains ~1GB of read performance and ~15TB of capacity.***
C. The system notifies support via Pure1 and waits for blade acknowledgement.
D. The system gains additional fault tolerance and increases the reserve capacity.

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Answer: B