Which statement is true about the IBM XIV model 314 and the IBM DS8886?

Which statement is true about the IBM XIV model 314 and the IBM DS8886?
A . Both the IBM DS8886 rack and the IBM XIV rack can be expanded
B . The IBM DS8886 rack can be expanded, but the IBM XIV rack cannot be expanded
C . Both the IBM XIV and the IBM DS8886 can be ordered in e-config for a customer supplied rack
D . Neither the IBM DS8886 nor the IBM XIV rack can be expanded

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Answer: B