Which of the following is a valid process to leverage the existing client investment and maintain the existing serial number?

A Power 770 MMD with two CEC enclosures, 256GB of memory, and PCIe expansion drawers with SAS disk is being upgraded to a Power E870.

Which of the following is a valid process to leverage the existing client investment and maintain the existing serial number?
A . Remove expansion drawers. Perform an MES upgrade of the memory and processor to POWER8. Migrate disk to the E870 system nodes.
B . Remove expansion drawers. Add EXP24
C . Perform an MES upgrade of the memory and processor to POWER8.
D . Migrate expansion drawers. Perform an MES upgrade of the memory and processor to POWER8.
E . Migrate expansion drawers. Migrate disk Perform an MES upgrade of the memory and processor to POWER8.

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Answer: B