What is a supported migration path for Symantec Endpoint Protection?

What is a supported migration path for Symantec Endpoint Protection?
A . Symantec Endpoint Protection Enterprise Edition 12.1 > Symantec Endpoint Protection Small Business Edition 12.1
B . Symantec Endpoint Protection Small Business Edition 12.1 > Symantec Endpoint Protection Enterprise Edition 12.1
C . Symantec Endpoint Protection 12.1 Enterprise Edition > Symantec Endpoint Protection 11.x Enterprise Edition
D . Symantec Endpoint Protection Small Business Edition 12.1 > Symantec Endpoint Protection 11.x Small Business Edition

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Answer: D