What is required to configured Lockstep mode on a BL460c Gen8?

What is required to configured Lockstep mode on a BL460c Gen8?
A. 1066 Mhz memory configuration
B. Dual rank memory configuration
C. Low power disabled

Correct Answer: B
Explanation/Reference:
Explanation:
http://bizsupport2.austin.hp.com/bc/docs/support/SupportManual/c03428245/c03428245.pdf

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