Which of the following options is correct about the description of RT? (Multiple Choice)

Which of the following options is correct about the description of RT? (Multiple Choice)
A . Each VPN instance is associated with one or more pairs of VPN target attributes to control the publishing and receiving of VPN routing information between sites.
B . RT can be divided into two types of VPN target attributes: export target and impor target
C . The settings of export target and impor target are independent of each other, and multiple values ​​can be set to achieve flexible VPN access control.
D . The RT value is advertised to neighbors through Update messages in the form of BGP extended community attributes.

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Answer: ABCD