Comparing an Oracle Exadata to an E870, what advantage does an E870 have when compared to the Exadata?

Comparing an Oracle Exadata to an E870, what advantage does an E870 have when compared to the Exadata?
A . E870 supports the Oracle 12c database.
B . E870 provides an ability to add cores and memory in a more granular manner.
C . E870 provides more cores for greater scaling.
D . E870 adds support for external storage.

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Answer: B