Which statements about BGP communities are true? (Select two.)

Which statements about BGP communities are true? (Select two.)
A . The community attribute is a transitive optional attribute.
B . High-order 16 bits encode the purpose and have local significance.
C . Low-order 16 bits contain the AS number of the AS that defines the community meaning.
D . BGP communities are means of tagging routes to ensure a consistent filtering.
E . The usable scope of communities is 1:0 through 65511:65555.

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Answer: AD