What is the minimum amount of rack space that an 80 core E870, without any I/O drawers, will take up in a 19 inch rack?

What is the minimum amount of rack space that an 80 core E870, without any I/O drawers, will take up in a 19 inch rack?
A . 8U
B . 10U
C . 22U
D . 12U

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Answer: D