Which of the following understanding of the LVS-Tomcat cluster model is correct? (Multiple choice)

Which of the following understanding of the LVS-Tomcat cluster model is correct? (Multiple choice)
A . LYS-TUN: IP Tunneling, in the original request IP packets to add a new IP header
B . Like this kind of load balancing and scheduling technology implemented in the Linux kernel, we call it Linux Virtual Server (LVS)
C . LVS-NAT: Network Address NetworkAddressTranslation, modify the request packet destination IP
D . LVS-DT: DirectRouting, manipulate new MAC addresses

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Answer: ABCD