What are disadvantages of Network Address Translation Transparency?（）
A. There is no disadvantage.
B. It will add 16 bytes per packet of overhead(8 bytes UDP header, and 8 bytes of NON-IKE Marker).
C. It will add 36 bytes per packet of overhead (20 bytes of IP header, 8 bytes of UDP header, 8 bytes of NON-IKE Marker).
D. It will require that both crypto peers support this feature in the IOS version. Both crypto peers must also have this feature enabled.
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