The incorrect description of XGSPON is:

The incorrect description of XGSPON is:
A . The maximum downstream rate is 9.95 Gbit/s, and the maximum upstream rate is 9.95 Gbit/s.
B . Maximum splitting ratio 1:256; a single PON port can access more ONUs, suitable for high-density scenarios
C . Improve the frame structure to adapt to the 10G rate and enhance the flexibility of DBA allocation
D . Simplify the physical layer message management mechanism, which is lower than GPON in terms of security and energy saving

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Answer: D