Which of the following statements regarding RT are true? (Multiple Choice)

Which of the following statements regarding RT are true? (Multiple Choice)
A . Each VPN instance is associated with one or more pairs of VPN Target attribute, used to control VPN routing information advertisement and reception between sites.
B . RTs are classified into two types: Export Target and Import Target.
C . Export Target and Import Target are independent from each other and support multiple values to implement flexible VPN access control.
D . The RT value is advertised to neighbors through the BGP extended community attribute in Update messages.

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Answer: ABCD