Which statement is true about a topology merge rule?

Which statement is true about a topology merge rule?
A . Specifies that the value of a resource field should be copied to the matchTokens field so that it can be used to merge events to resources
B . Merges two or more events together and relate them to the same topology resource
C . Specifies that the value of a resource field should be copied to the tags field so that it becomes searchable in the Ul
D . Specifies that two resources from different topology Observer jobs in fact refer to the same physical device

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Answer: C